20 thg 3, 2016

Hiệu ứng làm đẹp cho blog

Muốn có một blog đẹp và sinh động hơn , chỉ với vài thao tác đơn giản
Sau đây mình sẽ chia sẻ một số hiệu ứng rất đẹp cho blog không thể bỏ qua  , đảm bảo bạn sẽ vừa ý ..





- 1 : Hiệu ứng sao vàng rơi

<marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;
 - 2 : Hiệu ứng tuyết rơi

<script type='text/javascript'>
// <![CDATA[
/*
https://sites.google.com/site/bloggertricksandtoolz/snowstormeffectbywww.bloggertricksandtoolz.com.js
   DHTML Snowstorm! OO-style Jascript-based Snow effect
   ----------------------------------------------------
   Version 1.4.20091115 (Previous rev: v1.3.20081215)
   Code by Scott Schiller - http://schillmania.com
   ----------------------------------------------------
  
   Initializes after body onload() by default (via addEventHandler() call at bottom.)
   To customize properties, edit below or override configuration after this script
   has run (but before body.onload), eg. snowStorm.snowStick = false;

*/

var snowStorm = null;

function SnowStorm() {

  // --- PROPERTIES ---

  this.flakesMax = 128;           // Limit total amount of snow made (falling + sticking)
  this.flakesMaxActive = 64;      // Limit amount of snow falling at once (less = lower CPU use)
  this.animationInterval = 33;    // Theoretical "miliseconds per frame" measurement. 20 = fast + smooth, but high CPU use. 50 = more conservative, but slower
  this.flakeBottom = null;        // Integer for Y axis snow limit, 0 or null for "full-screen" snow effect
  this.targetElement = null;      // element which snow will be appended to (document body if null/undefined) - can be an element ID string, or a DOM node reference
  this.followMouse = true;        // Snow will change movement with the user's mouse
  this.snowColor = '#fff';        // Don't eat (or use?) yellow snow.
  this.snowCharacter = '&bull;';  // &bull; = bullet, &middot; is square on some systems etc.
  this.snowStick = true;          // Whether or not snow should "stick" at the bottom. When off, will never collect.
  this.useMeltEffect = true;      // When recycling fallen snow (or rarely, when falling), have it "melt" and fade out if browser supports it
  this.useTwinkleEffect = false;  // Allow snow to randomly "flicker" in and out of view while falling
  this.usePositionFixed = false;  // true = snow not affected by window scroll. may increase CPU load, disabled by default - if enabled, used only where supported

  // --- less-used bits ---

  this.flakeLeftOffset = 0;       // amount to subtract from edges of container
  this.flakeRightOffset = 0;      // amount to subtract from edges of container
  this.flakeWidth = 8;            // max pixel width for snow element
  this.flakeHeight = 8;           // max pixel height for snow element
  this.vMaxX = 5;                 // Maximum X velocity range for snow
  this.vMaxY = 4;                 // Maximum Y velocity range
  this.zIndex = 0;                // CSS stacking order applied to each snowflake

  // --- End of user section ---

  // jslint global declarations
  /*global window, document, navigator, clearInterval, setInterval */

  var addEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
 return o.addEventListener(evtName,evtHandler,false);
  }:function(o,evtName,evtHandler) {
 return o.attachEvent('on'+evtName,evtHandler);
  });

  var removeEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
    return o.removeEventListener(evtName,evtHandler,false);
  }:function(o,evtName,evtHandler) {
 return o.detachEvent('on'+evtName,evtHandler);
  });

  function rnd(n,min) {
    if (isNaN(min)) {
   min = 0;
 }
    return (Math.random()*n)+min;
  }

  function plusMinus(n) {
    return (parseInt(rnd(2),10)==1?n*-1:n);
  }

  var s = this;
  var storm = this;
  this.timers = [];
  this.flakes = [];
  this.disabled = false;
  this.active = false;

  var isIE = navigator.userAgent.match(/msie/i);
  var isIE6 = navigator.userAgent.match(/msie 6/i);
  var isOldIE = (isIE && (isIE6 || navigator.userAgent.match(/msie 5/i)));
  var isWin9X = navigator.appVersion.match(/windows 98/i);
  var isiPhone = navigator.userAgent.match(/iphone/i);
  var isBackCompatIE = (isIE && document.compatMode == 'BackCompat');
  var noFixed = ((isBackCompatIE || isIE6 || isiPhone)?true:false);
  var screenX = null;
  var screenX2 = null;
  var screenY = null;
  var scrollY = null;
  var vRndX = null;
  var vRndY = null;
  var windOffset = 1;
  var windMultiplier = 2;
  var flakeTypes = 6;
  var fixedForEverything = false;
  var opacitySupported = (function(){
    try {
   document.createElement('div').style.opacity = '0.5';
    } catch (e) {
   return false;
    }
    return true;
  })();
  var docFrag = document.createDocumentFragment();
  if (s.flakeLeftOffset === null) {
 s.flakeLeftOffset = 0;
  }
  if (s.flakeRightOffset === null) {
 s.flakeRightOffset = 0;
  }

  this.meltFrameCount = 20;
  this.meltFrames = [];
  for (var i=0; i<this.meltFrameCount; i++) {
 this.meltFrames.push(1-(i/this.meltFrameCount));
  }

  this.randomizeWind = function() {
    vRndX = plusMinus(rnd(s.vMaxX,0.2));
    vRndY = rnd(s.vMaxY,0.2);
    if (this.flakes) {
      for (var i=0; i<this.flakes.length; i++) {
        if (this.flakes[i].active) {
          this.flakes[i].setVelocities();
  }
      }
    }
  };

  this.scrollHandler = function() {
    // "attach" snowflakes to bottom of window if no absolute bottom value was given
    scrollY = (s.flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop,10));
    if (isNaN(scrollY)) {
   scrollY = 0; // Netscape 6 scroll fix
 }
    if (!fixedForEverything && !s.flakeBottom && s.flakes) {
      for (var i=s.flakes.length; i--;) {
        if (s.flakes[i].active === 0) {
       s.flakes[i].stick();
  }
      }
    }
  };

  this.resizeHandler = function() {
    if (window.innerWidth || window.innerHeight) {
      screenX = window.innerWidth-(!isIE?16:2)-s.flakeRightOffset;
      screenY = (s.flakeBottom?s.flakeBottom:window.innerHeight);
    } else {
      screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0)-s.flakeRightOffset;
      screenY = s.flakeBottom?s.flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
    }
    screenX2 = parseInt(screenX/2,10);
  };

  this.resizeHandlerAlt = function() {
    screenX = s.targetElement.offsetLeft+s.targetElement.offsetWidth-s.flakeRightOffset;
    screenY = s.flakeBottom?s.flakeBottom:s.targetElement.offsetTop+s.targetElement.offsetHeight;
    screenX2 = parseInt(screenX/2,10);
  };

  this.freeze = function() {
    // pause animation
    if (!s.disabled) {
      s.disabled = 1;
    } else {
      return false;
    }
    for (var i=s.timers.length; i--;) {
      clearInterval(s.timers[i]);
    }
  };

  this.resume = function() {
    if (s.disabled) {
       s.disabled = 0;
    } else {
      return false;
    }
    s.timerInit();
  };

  this.toggleSnow = function() {
    if (!s.flakes.length) {
      // first run
      s.start();
    } else {
      s.active = !s.active;
      if (s.active) {
        s.show();
        s.resume();
      } else {
        s.stop();
        s.freeze();
      }
    }
  };

  this.stop = function() {
    this.freeze();
    for (var i=this.flakes.length; i--;) {
      this.flakes[i].o.style.display = 'none';
    }
    removeEvent(window,'scroll',s.scrollHandler);
    removeEvent(window,'resize',s.resizeHandler);
    if (!isOldIE) {
      removeEvent(window,'blur',s.freeze);
      removeEvent(window,'focus',s.resume);
    }
  };

  this.show = function() {
    for (var i=this.flakes.length; i--;) {
      this.flakes[i].o.style.display = 'block';
    }
  };

  this.SnowFlake = function(parent,type,x,y) {
    var s = this;
    var storm = parent;
    this.type = type;
    this.x = x||parseInt(rnd(screenX-20),10);
    this.y = (!isNaN(y)?y:-rnd(screenY)-12);
    this.vX = null;
    this.vY = null;
    this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type)
    this.vAmp = this.vAmpTypes[this.type];
    this.melting = false;
    this.meltFrameCount = storm.meltFrameCount;
    this.meltFrames = storm.meltFrames;
    this.meltFrame = 0;
    this.twinkleFrame = 0;
    this.active = 1;
    this.fontSize = (10+(this.type/5)*10);
    this.o = document.createElement('div');
    this.o.innerHTML = storm.snowCharacter;
    this.o.style.color = storm.snowColor;
    this.o.style.position = (fixedForEverything?'fixed':'absolute');
    this.o.style.width = storm.flakeWidth+'px';
    this.o.style.height = storm.flakeHeight+'px';
    this.o.style.fontFamily = 'arial,verdana';
    this.o.style.overflow = 'hidden';
    this.o.style.fontWeight = 'normal';
    this.o.style.zIndex = storm.zIndex;
    docFrag.appendChild(this.o);

    this.refresh = function() {
   if (isNaN(s.x) || isNaN(s.y)) {
  // safety check
  return false;
   }
      s.o.style.left = s.x+'px';
      s.o.style.top = s.y+'px';
    };

    this.stick = function() {
      if (noFixed || (storm.targetElement != document.documentElement && storm.targetElement != document.body)) {
        s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px';
      } else if (storm.flakeBottom) {
     s.o.style.top = storm.flakeBottom+'px';
   } else {
        s.o.style.display = 'none';
     s.o.style.top = 'auto';
        s.o.style.bottom = '0px';
     s.o.style.position = 'fixed';
        s.o.style.display = 'block';
      }
    };

    this.vCheck = function() {
      if (s.vX>=0 && s.vX<0.2) {
        s.vX = 0.2;
      } else if (s.vX<0 && s.vX>-0.2) {
        s.vX = -0.2;
      }
      if (s.vY>=0 && s.vY<0.2) {
        s.vY = 0.2;
      }
    };

    this.move = function() {
      var vX = s.vX*windOffset;
      s.x += vX;
      s.y += (s.vY*s.vAmp);
      if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check
        s.x = 0;
      } else if (vX < 0 && s.x-storm.flakeLeftOffset<0-storm.flakeWidth) {
        s.x = screenX-storm.flakeWidth-1; // flakeWidth;
      }
      s.refresh();
      var yDiff = screenY+scrollY-s.y;
      if (yDiff<storm.flakeHeight) {
        s.active = 0;
     if (storm.snowStick) {
          s.stick();
     } else {
       s.recycle();
     }
      } else {
     if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) {
       // ~1/1000 chance of melting mid-air, with each frame
       s.melting = true;
       s.melt();
       // only incrementally melt one frame
       // s.melting = false;
     }
     if (storm.useTwinkleEffect) {
    if (!s.twinkleFrame) {
   if (Math.random()>0.9) {
        s.twinkleFrame = parseInt(Math.random()*20,10);
      }
    } else {
   s.twinkleFrame--;
   s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame%2===0?'hidden':'visible');
    }
     }
      }
    };

    this.animate = function() {
      // main animation loop
      // move, check status, die etc.
      s.move();
    };

    this.setVelocities = function() {
      s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1);
      s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1);
    };

 this.setOpacity = function(o,opacity) {
   if (!opacitySupported) {
  return false;
   }
   o.style.opacity = opacity;
 };

    this.melt = function() {
   if (!storm.useMeltEffect || !s.melting) {
  s.recycle();
   } else {
  if (s.meltFrame < s.meltFrameCount) {
    s.meltFrame++;
    s.setOpacity(s.o,s.meltFrames[s.meltFrame]);
    s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px';
    s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px';
  } else {
    s.recycle();
  }
   }
    };

    this.recycle = function() {
      s.o.style.display = 'none';
      s.o.style.position = (fixedForEverything?'fixed':'absolute');
      s.o.style.bottom = 'auto';
      s.setVelocities();
      s.vCheck();
   s.meltFrame = 0;
   s.melting = false;
   s.setOpacity(s.o,1);
   s.o.style.padding = '0px';
   s.o.style.margin = '0px';
   s.o.style.fontSize = s.fontSize+'px';
   s.o.style.lineHeight = (storm.flakeHeight+2)+'px';
   s.o.style.textAlign = 'center';
   s.o.style.verticalAlign = 'baseline';
      s.x = parseInt(rnd(screenX-storm.flakeWidth-20),10);
      s.y = parseInt(rnd(screenY)*-1,10)-storm.flakeHeight;
      s.refresh();
      s.o.style.display = 'block';
      s.active = 1;
    };

    this.recycle(); // set up x/y coords etc.
    this.refresh();

  };

  this.snow = function() {
    var active = 0;
    var used = 0;
    var waiting = 0;
    var flake = null;
    for (var i=s.flakes.length; i--;) {
      if (s.flakes[i].active == 1) {
        s.flakes[i].move();
        active++;
      } else if (s.flakes[i].active === 0) {
        used++;
      } else {
        waiting++;
      }
      if (s.flakes[i].melting) {
     s.flakes[i].melt();
   }
    }
    if (active<s.flakesMaxActive) {
      flake = s.flakes[parseInt(rnd(s.flakes.length),10)];
      if (flake.active === 0) {
        flake.melting = true;
      }
    }
  };

  this.mouseMove = function(e) {
    if (!s.followMouse) {
   return true;
 }
    var x = parseInt(e.clientX,10);
    if (x<screenX2) {
      windOffset = -windMultiplier+(x/screenX2*windMultiplier);
    } else {
      x -= screenX2;
      windOffset = (x/screenX2)*windMultiplier;
    }
  };

  this.createSnow = function(limit,allowInactive) {
    for (var i=0; i<limit; i++) {
      s.flakes[s.flakes.length] = new s.SnowFlake(s,parseInt(rnd(flakeTypes),10));
      if (allowInactive || i>s.flakesMaxActive) {
     s.flakes[s.flakes.length-1].active = -1;
   }
    }
    storm.targetElement.appendChild(docFrag);
  };

  this.timerInit = function() {
    s.timers = (!isWin9X?[setInterval(s.snow,s.animationInterval)]:[setInterval(s.snow,s.animationInterval*3),setInterval(s.snow,s.animationInterval)]);
  };

  this.init = function() {
    s.randomizeWind();
    s.createSnow(s.flakesMax); // create initial batch
    addEvent(window,'resize',s.resizeHandler);
    addEvent(window,'scroll',s.scrollHandler);
    if (!isOldIE) {
      addEvent(window,'blur',s.freeze);
      addEvent(window,'focus',s.resume);
    }
    s.resizeHandler();
    s.scrollHandler();
    if (s.followMouse) {
      addEvent(document,'mousemove',s.mouseMove);
    }
    s.animationInterval = Math.max(20,s.animationInterval);
    s.timerInit();
  };

  var didInit = false;

  this.start = function(bFromOnLoad) {
 if (!didInit) {
   didInit = true;
 } else if (bFromOnLoad) {
   // already loaded and running
   return true;
 }
    if (typeof s.targetElement == 'string') {
   var targetID = s.targetElement;
      s.targetElement = document.getElementById(targetID);
      if (!s.targetElement) {
     throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"');
   }
    }
 if (!s.targetElement) {
   s.targetElement = (!isIE?(document.documentElement?document.documentElement:document.body):document.body);
 }
    if (s.targetElement != document.documentElement && s.targetElement != document.body) {
   s.resizeHandler = s.resizeHandlerAlt; // re-map handler to get element instead of screen dimensions
 }
    s.resizeHandler(); // get bounding box elements
    s.usePositionFixed = (s.usePositionFixed && !noFixed); // whether or not position:fixed is supported
    fixedForEverything = s.usePositionFixed;
    if (screenX && screenY && !s.disabled) {
      s.init();
      s.active = true;
    }
  };

  function doStart() {
   s.start(true);
  }

  if (document.addEventListener) {
    // safari 3.0.4 doesn't do DOMContentLoaded, maybe others - use a fallback to be safe.
    document.addEventListener('DOMContentLoaded',doStart,false);
    window.addEventListener('load',doStart,false);
  } else {
    addEvent(window,'load',doStart);
  }

}

snowStorm = new SnowStorm();
// ]]>
</script>

 - 3 : Hiệu ứng sao nhấp nháy rơi

<marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:601px;top:7px;width:auto;height:653px;z-index:1;" scrollamount="2"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:720px;top:64px;width:auto;height:232px;z-index:1;" scrollamount="1"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:735px;top:50px;width:auto;height:321px;z-index:1;" scrollamount="1"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:608px;top:78px;width:auto;height:125px;z-index:1;" scrollamount="6"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:43px;top:62px;width:auto;height:10px;z-index:1;" scrollamount="1"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:539px;top:97px;width:auto;height:426px;z-index:1;" scrollamount=""><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:791px;top:45px;width:auto;height:178px;z-index:1;" scrollamount="3"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:278px;top:104px;width:auto;height:701px;z-index:1;" scrollamount="3"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:404px;top:69px;width:auto;height:211px;z-index:1;" scrollamount="2"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:331px;top:2px;width:auto;height:293px;z-index:1;" scrollamount="1"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:655px;top:89px;width:auto;height:399px;z-index:1;" scrollamount="7"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:813px;top:11px;width:auto;height:429px;z-index:1;" scrollamount="5"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:254px;top:109px;width:auto;height:146px;z-index:1;" scrollamount="7"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:616px;top:20px;width:auto;height:534px;z-index:1;" scrollamount=""><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:652px;top:42px;width:auto;height:410px;z-index:1;" scrollamount="1"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:707px;top:96px;width:auto;height:39px;z-index:1;" scrollamount=""><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:200px;top:76px;width:auto;height:137px;z-index:1;" scrollamount=""><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:309px;top:13px;width:auto;height:338px;z-index:1;" scrollamount="5"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:622px;top:107px;width:auto;height:676px;z-index:1;" scrollamount="5"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:149px;top:76px;width:auto;height:199px;z-index:1;" scrollamount="5"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee><marquee behavior="scroll" direction="down" style="position:absolute;border:0px;padding:0px;margin:0px;left:506px;top:77px;width:auto;height:344px;z-index:1;" scrollamount="5"><span class="falling1"><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0RU2NzbOpX08swb6Ak10EBzu1TANEQiPcNqCWymSOILGLCAgj0ZoCBDzgwQ8MgdvrKDRV3fTNOgQiUE7KGU0854_15HS3eVOdA7o734MAAGikfqn8HoCUx9wAZzpTHONOJxW9ZQSBoIE/"/></span></marquee>

 - 4 : Hiệu ứng bông tuyết rơi

<script type='text/javascript'>
// <![CDATA[
/*
https://sites.google.com/site/bloggertricksandtoolz/snowstormeffectbywww.bloggertricksandtoolz.com.js
   DHTML Snowstorm! OO-style Jascript-based Snow effect
   ----------------------------------------------------
   Version 1.4.20091115 (Previous rev: v1.3.20081215)
   Code by Scott Schiller - http://schillmania.com
   ----------------------------------------------------
  
   Initializes after body onload() by default (via addEventHandler() call at bottom.)
   To customize properties, edit below or override configuration after this script
   has run (but before body.onload), eg. snowStorm.snowStick = false;

*/

var snowStorm = null;

function SnowStorm() {

  // --- PROPERTIES ---

  this.flakesMax = 128;           // Limit total amount of snow made (falling + sticking)
  this.flakesMaxActive = 64;      // Limit amount of snow falling at once (less = lower CPU use)
  this.animationInterval = 33;    // Theoretical "miliseconds per frame" measurement. 20 = fast + smooth, but high CPU use. 50 = more conservative, but slower
  this.flakeBottom = null;        // Integer for Y axis snow limit, 0 or null for "full-screen" snow effect
  this.targetElement = null;      // element which snow will be appended to (document body if null/undefined) - can be an element ID string, or a DOM node reference
  this.followMouse = true;        // Snow will change movement with the user's mouse
  this.snowColor = '#fff';        // Don't eat (or use?) yellow snow.
  this.snowCharacter = '&bull;';  // &bull; = bullet, &middot; is square on some systems etc.
  this.snowStick = true;          // Whether or not snow should "stick" at the bottom. When off, will never collect.
  this.useMeltEffect = true;      // When recycling fallen snow (or rarely, when falling), have it "melt" and fade out if browser supports it
  this.useTwinkleEffect = false;  // Allow snow to randomly "flicker" in and out of view while falling
  this.usePositionFixed = false;  // true = snow not affected by window scroll. may increase CPU load, disabled by default - if enabled, used only where supported

  // --- less-used bits ---

  this.flakeLeftOffset = 0;       // amount to subtract from edges of container
  this.flakeRightOffset = 0;      // amount to subtract from edges of container
  this.flakeWidth = 8;            // max pixel width for snow element
  this.flakeHeight = 8;           // max pixel height for snow element
  this.vMaxX = 5;                 // Maximum X velocity range for snow
  this.vMaxY = 4;                 // Maximum Y velocity range
  this.zIndex = 0;                // CSS stacking order applied to each snowflake

  // --- End of user section ---

  // jslint global declarations
  /*global window, document, navigator, clearInterval, setInterval */

  var addEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
 return o.addEventListener(evtName,evtHandler,false);
  }:function(o,evtName,evtHandler) {
 return o.attachEvent('on'+evtName,evtHandler);
  });

  var removeEvent = (typeof(window.attachEvent)=='undefined'?function(o,evtName,evtHandler) {
    return o.removeEventListener(evtName,evtHandler,false);
  }:function(o,evtName,evtHandler) {
 return o.detachEvent('on'+evtName,evtHandler);
  });

  function rnd(n,min) {
    if (isNaN(min)) {
   min = 0;
 }
    return (Math.random()*n)+min;
  }

  function plusMinus(n) {
    return (parseInt(rnd(2),10)==1?n*-1:n);
  }

  var s = this;
  var storm = this;
  this.timers = [];
  this.flakes = [];
  this.disabled = false;
  this.active = false;

  var isIE = navigator.userAgent.match(/msie/i);
  var isIE6 = navigator.userAgent.match(/msie 6/i);
  var isOldIE = (isIE && (isIE6 || navigator.userAgent.match(/msie 5/i)));
  var isWin9X = navigator.appVersion.match(/windows 98/i);
  var isiPhone = navigator.userAgent.match(/iphone/i);
  var isBackCompatIE = (isIE && document.compatMode == 'BackCompat');
  var noFixed = ((isBackCompatIE || isIE6 || isiPhone)?true:false);
  var screenX = null;
  var screenX2 = null;
  var screenY = null;
  var scrollY = null;
  var vRndX = null;
  var vRndY = null;
  var windOffset = 1;
  var windMultiplier = 2;
  var flakeTypes = 6;
  var fixedForEverything = false;
  var opacitySupported = (function(){
    try {
   document.createElement('div').style.opacity = '0.5';
    } catch (e) {
   return false;
    }
    return true;
  })();
  var docFrag = document.createDocumentFragment();
  if (s.flakeLeftOffset === null) {
 s.flakeLeftOffset = 0;
  }
  if (s.flakeRightOffset === null) {
 s.flakeRightOffset = 0;
  }

  this.meltFrameCount = 20;
  this.meltFrames = [];
  for (var i=0; i<this.meltFrameCount; i++) {
 this.meltFrames.push(1-(i/this.meltFrameCount));
  }

  this.randomizeWind = function() {
    vRndX = plusMinus(rnd(s.vMaxX,0.2));
    vRndY = rnd(s.vMaxY,0.2);
    if (this.flakes) {
      for (var i=0; i<this.flakes.length; i++) {
        if (this.flakes[i].active) {
          this.flakes[i].setVelocities();
  }
      }
    }
  };

  this.scrollHandler = function() {
    // "attach" snowflakes to bottom of window if no absolute bottom value was given
    scrollY = (s.flakeBottom?0:parseInt(window.scrollY||document.documentElement.scrollTop||document.body.scrollTop,10));
    if (isNaN(scrollY)) {
   scrollY = 0; // Netscape 6 scroll fix
 }
    if (!fixedForEverything && !s.flakeBottom && s.flakes) {
      for (var i=s.flakes.length; i--;) {
        if (s.flakes[i].active === 0) {
       s.flakes[i].stick();
  }
      }
    }
  };

  this.resizeHandler = function() {
    if (window.innerWidth || window.innerHeight) {
      screenX = window.innerWidth-(!isIE?16:2)-s.flakeRightOffset;
      screenY = (s.flakeBottom?s.flakeBottom:window.innerHeight);
    } else {
      screenX = (document.documentElement.clientWidth||document.body.clientWidth||document.body.scrollWidth)-(!isIE?8:0)-s.flakeRightOffset;
      screenY = s.flakeBottom?s.flakeBottom:(document.documentElement.clientHeight||document.body.clientHeight||document.body.scrollHeight);
    }
    screenX2 = parseInt(screenX/2,10);
  };

  this.resizeHandlerAlt = function() {
    screenX = s.targetElement.offsetLeft+s.targetElement.offsetWidth-s.flakeRightOffset;
    screenY = s.flakeBottom?s.flakeBottom:s.targetElement.offsetTop+s.targetElement.offsetHeight;
    screenX2 = parseInt(screenX/2,10);
  };

  this.freeze = function() {
    // pause animation
    if (!s.disabled) {
      s.disabled = 1;
    } else {
      return false;
    }
    for (var i=s.timers.length; i--;) {
      clearInterval(s.timers[i]);
    }
  };

  this.resume = function() {
    if (s.disabled) {
       s.disabled = 0;
    } else {
      return false;
    }
    s.timerInit();
  };

  this.toggleSnow = function() {
    if (!s.flakes.length) {
      // first run
      s.start();
    } else {
      s.active = !s.active;
      if (s.active) {
        s.show();
        s.resume();
      } else {
        s.stop();
        s.freeze();
      }
    }
  };

  this.stop = function() {
    this.freeze();
    for (var i=this.flakes.length; i--;) {
      this.flakes[i].o.style.display = 'none';
    }
    removeEvent(window,'scroll',s.scrollHandler);
    removeEvent(window,'resize',s.resizeHandler);
    if (!isOldIE) {
      removeEvent(window,'blur',s.freeze);
      removeEvent(window,'focus',s.resume);
    }
  };

  this.show = function() {
    for (var i=this.flakes.length; i--;) {
      this.flakes[i].o.style.display = 'block';
    }
  };

  this.SnowFlake = function(parent,type,x,y) {
    var s = this;
    var storm = parent;
    this.type = type;
    this.x = x||parseInt(rnd(screenX-20),10);
    this.y = (!isNaN(y)?y:-rnd(screenY)-12);
    this.vX = null;
    this.vY = null;
    this.vAmpTypes = [1,1.2,1.4,1.6,1.8]; // "amplification" for vX/vY (based on flake size/type)
    this.vAmp = this.vAmpTypes[this.type];
    this.melting = false;
    this.meltFrameCount = storm.meltFrameCount;
    this.meltFrames = storm.meltFrames;
    this.meltFrame = 0;
    this.twinkleFrame = 0;
    this.active = 1;
    this.fontSize = (10+(this.type/5)*10);
    this.o = document.createElement('div');
    this.o.innerHTML = storm.snowCharacter;
    this.o.style.color = storm.snowColor;
    this.o.style.position = (fixedForEverything?'fixed':'absolute');
    this.o.style.width = storm.flakeWidth+'px';
    this.o.style.height = storm.flakeHeight+'px';
    this.o.style.fontFamily = 'arial,verdana';
    this.o.style.overflow = 'hidden';
    this.o.style.fontWeight = 'normal';
    this.o.style.zIndex = storm.zIndex;
    docFrag.appendChild(this.o);

    this.refresh = function() {
   if (isNaN(s.x) || isNaN(s.y)) {
  // safety check
  return false;
   }
      s.o.style.left = s.x+'px';
      s.o.style.top = s.y+'px';
    };

    this.stick = function() {
      if (noFixed || (storm.targetElement != document.documentElement && storm.targetElement != document.body)) {
        s.o.style.top = (screenY+scrollY-storm.flakeHeight)+'px';
      } else if (storm.flakeBottom) {
     s.o.style.top = storm.flakeBottom+'px';
   } else {
        s.o.style.display = 'none';
     s.o.style.top = 'auto';
        s.o.style.bottom = '0px';
     s.o.style.position = 'fixed';
        s.o.style.display = 'block';
      }
    };

    this.vCheck = function() {
      if (s.vX>=0 && s.vX<0.2) {
        s.vX = 0.2;
      } else if (s.vX<0 && s.vX>-0.2) {
        s.vX = -0.2;
      }
      if (s.vY>=0 && s.vY<0.2) {
        s.vY = 0.2;
      }
    };

    this.move = function() {
      var vX = s.vX*windOffset;
      s.x += vX;
      s.y += (s.vY*s.vAmp);
      if (s.x >= screenX || screenX-s.x < storm.flakeWidth) { // X-axis scroll check
        s.x = 0;
      } else if (vX < 0 && s.x-storm.flakeLeftOffset<0-storm.flakeWidth) {
        s.x = screenX-storm.flakeWidth-1; // flakeWidth;
      }
      s.refresh();
      var yDiff = screenY+scrollY-s.y;
      if (yDiff<storm.flakeHeight) {
        s.active = 0;
     if (storm.snowStick) {
          s.stick();
     } else {
       s.recycle();
     }
      } else {
     if (storm.useMeltEffect && s.active && s.type < 3 && !s.melting && Math.random()>0.998) {
       // ~1/1000 chance of melting mid-air, with each frame
       s.melting = true;
       s.melt();
       // only incrementally melt one frame
       // s.melting = false;
     }
     if (storm.useTwinkleEffect) {
    if (!s.twinkleFrame) {
   if (Math.random()>0.9) {
        s.twinkleFrame = parseInt(Math.random()*20,10);
      }
    } else {
   s.twinkleFrame--;
   s.o.style.visibility = (s.twinkleFrame && s.twinkleFrame%2===0?'hidden':'visible');
    }
     }
      }
    };

    this.animate = function() {
      // main animation loop
      // move, check status, die etc.
      s.move();
    };

    this.setVelocities = function() {
      s.vX = vRndX+rnd(storm.vMaxX*0.12,0.1);
      s.vY = vRndY+rnd(storm.vMaxY*0.12,0.1);
    };

 this.setOpacity = function(o,opacity) {
   if (!opacitySupported) {
  return false;
   }
   o.style.opacity = opacity;
 };

    this.melt = function() {
   if (!storm.useMeltEffect || !s.melting) {
  s.recycle();
   } else {
  if (s.meltFrame < s.meltFrameCount) {
    s.meltFrame++;
    s.setOpacity(s.o,s.meltFrames[s.meltFrame]);
    s.o.style.fontSize = s.fontSize-(s.fontSize*(s.meltFrame/s.meltFrameCount))+'px';
    s.o.style.lineHeight = storm.flakeHeight+2+(storm.flakeHeight*0.75*(s.meltFrame/s.meltFrameCount))+'px';
  } else {
    s.recycle();
  }
   }
    };

    this.recycle = function() {
      s.o.style.display = 'none';
      s.o.style.position = (fixedForEverything?'fixed':'absolute');
      s.o.style.bottom = 'auto';
      s.setVelocities();
      s.vCheck();
   s.meltFrame = 0;
   s.melting = false;
   s.setOpacity(s.o,1);
   s.o.style.padding = '0px';
   s.o.style.margin = '0px';
   s.o.style.fontSize = s.fontSize+'px';
   s.o.style.lineHeight = (storm.flakeHeight+2)+'px';
   s.o.style.textAlign = 'center';
   s.o.style.verticalAlign = 'baseline';
      s.x = parseInt(rnd(screenX-storm.flakeWidth-20),10);
      s.y = parseInt(rnd(screenY)*-1,10)-storm.flakeHeight;
      s.refresh();
      s.o.style.display = 'block';
      s.active = 1;
    };

    this.recycle(); // set up x/y coords etc.
    this.refresh();

  };

  this.snow = function() {
    var active = 0;
    var used = 0;
    var waiting = 0;
    var flake = null;
    for (var i=s.flakes.length; i--;) {
      if (s.flakes[i].active == 1) {
        s.flakes[i].move();
        active++;
      } else if (s.flakes[i].active === 0) {
        used++;
      } else {
        waiting++;
      }
      if (s.flakes[i].melting) {
     s.flakes[i].melt();
   }
    }
    if (active<s.flakesMaxActive) {
      flake = s.flakes[parseInt(rnd(s.flakes.length),10)];
      if (flake.active === 0) {
        flake.melting = true;
      }
    }
  };

  this.mouseMove = function(e) {
    if (!s.followMouse) {
   return true;
 }
    var x = parseInt(e.clientX,10);
    if (x<screenX2) {
      windOffset = -windMultiplier+(x/screenX2*windMultiplier);
    } else {
      x -= screenX2;
      windOffset = (x/screenX2)*windMultiplier;
    }
  };

  this.createSnow = function(limit,allowInactive) {
    for (var i=0; i<limit; i++) {
      s.flakes[s.flakes.length] = new s.SnowFlake(s,parseInt(rnd(flakeTypes),10));
      if (allowInactive || i>s.flakesMaxActive) {
     s.flakes[s.flakes.length-1].active = -1;
   }
    }
    storm.targetElement.appendChild(docFrag);
  };

  this.timerInit = function() {
    s.timers = (!isWin9X?[setInterval(s.snow,s.animationInterval)]:[setInterval(s.snow,s.animationInterval*3),setInterval(s.snow,s.animationInterval)]);
  };

  this.init = function() {
    s.randomizeWind();
    s.createSnow(s.flakesMax); // create initial batch
    addEvent(window,'resize',s.resizeHandler);
    addEvent(window,'scroll',s.scrollHandler);
    if (!isOldIE) {
      addEvent(window,'blur',s.freeze);
      addEvent(window,'focus',s.resume);
    }
    s.resizeHandler();
    s.scrollHandler();
    if (s.followMouse) {
      addEvent(document,'mousemove',s.mouseMove);
    }
    s.animationInterval = Math.max(20,s.animationInterval);
    s.timerInit();
  };

  var didInit = false;

  this.start = function(bFromOnLoad) {
 if (!didInit) {
   didInit = true;
 } else if (bFromOnLoad) {
   // already loaded and running
   return true;
 }
    if (typeof s.targetElement == 'string') {
   var targetID = s.targetElement;
      s.targetElement = document.getElementById(targetID);
      if (!s.targetElement) {
     throw new Error('Snowstorm: Unable to get targetElement "'+targetID+'"');
   }
    }
 if (!s.targetElement) {
   s.targetElement = (!isIE?(document.documentElement?document.documentElement:document.body):document.body);
 }
    if (s.targetElement != document.documentElement && s.targetElement != document.body) {
   s.resizeHandler = s.resizeHandlerAlt; // re-map handler to get element instead of screen dimensions
 }
    s.resizeHandler(); // get bounding box elements
    s.usePositionFixed = (s.usePositionFixed && !noFixed); // whether or not position:fixed is supported
    fixedForEverything = s.usePositionFixed;
    if (screenX && screenY && !s.disabled) {
      s.init();
      s.active = true;
    }
  };

  function doStart() {
   s.start(true);
  }

  if (document.addEventListener) {
    // safari 3.0.4 doesn't do DOMContentLoaded, maybe others - use a fallback to be safe.
    document.addEventListener('DOMContentLoaded',doStart,false);
    window.addEventListener('load',doStart,false);
  } else {
    addEvent(window,'load',doStart);
  }

}

snowStorm = new SnowStorm();
// ]]>
</script>

- 5 : Hiệu ứng lá vàng rơi

<script type='text/javascript'>
// <![CDATA[

  //Configure below to change URL path to the snow image
  var snowsrc="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZtrFd9Ful6JltebCJClMtKWBfIOjWtr0bEFhqwX9v9XcKCThFePSC8kpuXoABfg9mxfBPVhh37W5wtU_OvM9oO463f-NQuxLOeEty4ztX90MwtpjL0XXmM7gpiw7tZtJufl_s3XgrErw/s1600/FallingLeaves.gif"
  // Configure below to change number of snow to render
  var no = 10;
  // Configure whether snow should disappear after x seconds (0=never):
  var hidesnowtime = 0;
  // Configure how much snow should drop down before fading ("windowheight" or "pageheight")
  var snowdistance = "pageheight";

///////////Stop Config//////////////////////////////////

  var ie4up = (document.all) ? 1 : 0;
  var ns6up = (document.getElementById&&!document.all) ? 1 : 0;

 function iecompattest(){
 return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
 }

  var dx, xp, yp;    // coordinate and position variables
  var am, stx, sty;  // amplitude and step variables
  var i, doc_width = 800, doc_height = 600; 
  
  if (ns6up) {
    doc_width = self.innerWidth;
    doc_height = self.innerHeight;
  } else if (ie4up) {
    doc_width = iecompattest().clientWidth;
    doc_height = iecompattest().clientHeight;
  }

  dx = new Array();
  xp = new Array();
  yp = new Array();
  am = new Array();
  stx = new Array();
  sty = new Array();
  snowsrc=(snowsrc.indexOf("dynamicdrive.com")!=-1)? "snow.gif" : snowsrc
  for (i = 0; i < no; ++ i) {  
    dx[i] = 0;                        // set coordinate variables
    xp[i] = Math.random()*(doc_width-50);  // set position variables
    yp[i] = Math.random()*doc_height;
    am[i] = Math.random()*20;         // set amplitude variables
    stx[i] = 0.02 + Math.random()/10; // set step variables
    sty[i] = 0.7 + Math.random();     // set step variables
  if (ie4up||ns6up) {
      if (i == 0) {
        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a href=\"http://dynamicdrive.com\"><img src='"+snowsrc+"' border=\"0\"><\/a><\/div>");
      } else {
        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
      }
    }
  }

  function snowIE_NS6() {  // IE and NS6 main animation function
    doc_width = ns6up?window.innerWidth-10 : iecompattest().clientWidth-10;
  doc_height=(window.innerHeight && snowdistance=="windowheight")? window.innerHeight : (ie4up && snowdistance=="windowheight")?  iecompattest().clientHeight : (ie4up && !window.opera && snowdistance=="pageheight")? iecompattest().scrollHeight : iecompattest().offsetHeight;
    for (i = 0; i < no; ++ i) {  // iterate for every dot
      yp[i] += sty[i];
      if (yp[i] > doc_height-50) {
        xp[i] = Math.random()*(doc_width-am[i]-30);
        yp[i] = 0;
        stx[i] = 0.02 + Math.random()/10;
        sty[i] = 0.7 + Math.random();
      }
      dx[i] += stx[i];
      document.getElementById("dot"+i).style.top=yp[i]+"px";
      document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i])+"px";  
    }
    snowtimer=setTimeout("snowIE_NS6()", 10);
  }

 function hidesnow(){
  if (window.snowtimer) clearTimeout(snowtimer)
  for (i=0; i<no; i++) document.getElementById("dot"+i).style.visibility="hidden"
 }
  

if (ie4up||ns6up){
    snowIE_NS6();
  if (hidesnowtime>0)
  setTimeout("hidesnow()", hidesnowtime*1000)
  }
// ]]>
</script>

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1- Đăng nhập vào Blog, 
2- Chọn Bố cục
3- Chọn Thêm tiện ích > chọn HTML/Javacript dán code bạn muốn vào
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