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 Estrellitas de colores caen del Mouse 

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  // <![CDATA[
  var colour="random";
  var sparkles=100;

  /****************************
  *  Tinkerbell Magic Sparkle *
  *(c)2005-12 mf2fm web-design*
  *  http://www.mf2fm.com/rv  *
  * DON'T EDIT BELOW THIS BOX *
  ****************************/
  var x=ox=400;
  var y=oy=300;
  var swide=800;
  var shigh=600;
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  var tinyx=new Array();
  var tinyy=new Array();
  var tinyv=new Array();

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  rats.style.zIndex="999";
      document.body.appendChild(tiny[i]=rats);
      starv[i]=0;
      tinyv[i]=0;
      var rats=createDiv(5, 5);
      rats.style.backgroundColor="transparent";
      rats.style.visibility="hidden";
  rats.style.zIndex="999";
      var rlef=createDiv(1, 5);
      var rdow=createDiv(5, 1);
      rats.appendChild(rlef);
      rats.appendChild(rdow);
      rlef.style.top="2px";
      rlef.style.left="0px";
      rdow.style.top="0px";
      rdow.style.left="2px";
      document.body.appendChild(star[i]=rats);
    }
    set_width();
    sparkle();
  }}

  function sparkle() {
    var c;
    if (x!=ox || y!=oy) {
      ox=x;
      oy=y;
      for (c=0; c<sparkles; c++) if (!starv[c]) {
        star[c].style.left=(starx[c]=x)+"px";
        star[c].style.top=(stary[c]=y)+"px";
        star[c].style.clip="rect(0px, 5px, 5px, 0px)";
        star[c].childNodes[0].style.backgroundColor=star[c].childNodes[1].style.backgroundColor=(colour=="random")?newColour():colour;
        star[c].style.visibility="visible";
        starv[c]=50;
        break;
      }
    }
    for (c=0; c<sparkles; c++) {
      if (starv[c]) update_star(c);
      if (tinyv[c]) update_tiny(c);
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    setTimeout("sparkle()", 40);
  }

  function update_star(i) {
    if (--starv[i]==25) star[i].style.clip="rect(1px, 4px, 4px, 1px)";
    if (starv[i]) {
      stary[i]+=1+Math.random()*3;
      starx[i]+=(i%5-2)/5;
      if (stary[i]<shigh+sdown) {
        star[i].style.top=stary[i]+"px";
        star[i].style.left=starx[i]+"px";
      }
      else {
        star[i].style.visibility="hidden";
        starv[i]=0;
        return;
      }
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    else {
      tinyv[i]=50;
      tiny[i].style.top=(tinyy[i]=stary[i])+"px";
      tiny[i].style.left=(tinyx[i]=starx[i])+"px";
      tiny[i].style.width="2px";
      tiny[i].style.height="2px";
      tiny[i].style.backgroundColor=star[i].childNodes[0].style.backgroundColor;
      star[i].style.visibility="hidden";
      tiny[i].style.visibility="visible"
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  function update_tiny(i) {
    if (--tinyv[i]==25) {
      tiny[i].style.width="1px";
      tiny[i].style.height="1px";
    }
    if (tinyv[i]) {
      tinyy[i]+=1+Math.random()*3;
      tinyx[i]+=(i%5-2)/5;
      if (tinyy[i]<shigh+sdown) {
        tiny[i].style.top=tinyy[i]+"px";
        tiny[i].style.left=tinyx[i]+"px";
      }
      else {
        tiny[i].style.visibility="hidden";
        tinyv[i]=0;
        return;
      }
    }
    else tiny[i].style.visibility="hidden";
  }

  document.onmousemove=mouse;
  function mouse(e) {
    if (e) {
      y=e.pageY;
      x=e.pageX;
    }
    else {
      set_scroll();
      y=event.y+sdown;
      x=event.x+sleft;
    }
  }

  window.onscroll=set_scroll;
  function set_scroll() {
    if (typeof(self.pageYOffset)=='number') {
      sdown=self.pageYOffset;
      sleft=self.pageXOffset;
    }
    else if (document.body && (document.body.scrollTop || document.body.scrollLeft)) {
      sdown=document.body.scrollTop;
      sleft=document.body.scrollLeft;
    }
    else if (document.documentElement && (document.documentElement.scrollTop || document.documentElement.scrollLeft)) {
      sleft=document.documentElement.scrollLeft;
      sdown=document.documentElement.scrollTop;
    }
    else {
      sdown=0;
      sleft=0;
    }
  }

  window.onresize=set_width;
  function set_width() {
    var sw_min=999999;
    var sh_min=999999;
    if (document.documentElement && document.documentElement.clientWidth) {
      if (document.documentElement.clientWidth>0) sw_min=document.documentElement.clientWidth;
      if (document.documentElement.clientHeight>0) sh_min=document.documentElement.clientHeight;
    }
    if (typeof(self.innerWidth)=='number' && self.innerWidth) {
      if (self.innerWidth>0 && self.innerWidth<sw_min) sw_min=self.innerWidth;
      if (self.innerHeight>0 && self.innerHeight<sh_min) sh_min=self.innerHeight;
    }
    if (document.body.clientWidth) {
      if (document.body.clientWidth>0 && document.body.clientWidth<sw_min) sw_min=document.body.clientWidth;
      if (document.body.clientHeight>0 && document.body.clientHeight<sh_min) sh_min=document.body.clientHeight;
    }
    if (sw_min==999999 || sh_min==999999) {
      sw_min=800;
      sh_min=600;
    }
    swide=sw_min;
    shigh=sh_min;
  }

  function createDiv(height, width) {
    var div=document.createElement("div");
    div.style.position="absolute";
    div.style.height=height+"px";
    div.style.width=width+"px";
    div.style.overflow="hidden";
    return (div);
  }

  function newColour() {
    var c=new Array();
    c[0]=255;
    c[1]=Math.floor(Math.random()*256);
    c[2]=Math.floor(Math.random()*(256-c[1]/2));
    c.sort(function(){return (0.5 - Math.random());});
    return ("rgb("+c[0]+", "+c[1]+", "+c[2]+")");
  }
  // ]]>
  </script>

Lluvia de Hojas

 <script>
//<![CDATA[
// Fall v2.0 By MaxxBlade - http://www.maxxblade.co.uk/fall
var fallObjects=new Array();function newObject(url,height,width){fallObjects[fallObjects.length]=new Array(url,height,width);}
var numObjs=15, waft=100, fallSpeed=5, wind=-1;

 newObject("http://lh5.googleusercontent.com/--jcOdbfXsBs/UGS2U_spSLI/AAAAAAAADCU/G-4XZ0mSEHg/s100/hoja1.png",29,15);
newObject("http://lh5.googleusercontent.com/-aE24R5QmbE4/UGS2U_hZj0I/AAAAAAAADCM/7Hb18sy3qfo/s100/hoja2.png",27,23);
newObject("http://lh6.googleusercontent.com/-9H8JyoZ6j3g/UGS2U2aOamI/AAAAAAAADCQ/6zY7uKgyV2A/s100/hoja3.png",46,15);
newObject("https://lh3.googleusercontent.com/-OhuXMSqpELQ/UGS2Vq8Qf0I/AAAAAAAADCg/UTCK1YQUZqA/s100/hoja4.png",36,33);
function winSize(){winWidth=(moz)?window.innerWidth:document.body.clientWidth;winHeight=(moz)?window.innerHeight:document.body.clientHeight;}
function fallObject(num,vari,nu){
objects[num]=new Array(parseInt(Math.random()*(winWidth-waft)),-30,(parseInt(Math.random()*waft))*((Math.random()>0.5)?1:-1),0.02+Math.random()/20,0,1+parseInt(Math.random()*fallSpeed),vari,fallObjects[vari][1],fallObjects[vari][2]);
if(nu==1){document.write('<img id="fO'+i+'" style="position:absolute;z-index:9;background:none;border:0;padding:0;box-shadow:none;" src="'+fallObjects[vari][0]+'">'); }
}
function fall(){
for(i=0;i<numObjs;i++){
var fallingObject=document.getElementById('fO'+i);
if((objects[i][1]>(winHeight-(objects[i][5]+objects[i][7])))||(objects[i][0]>(winWidth-(objects[i][2]+objects[i][8])))){fallObject(i,objects[i][6],0);}
objects[i][0]+=wind;objects[i][1]+=objects[i][5];objects[i][4]+=objects[i][3];
with(fallingObject.style){ top=objects[i][1]+winOffset+"px";left=objects[i][0]+(objects[i][2]*Math.cos(objects[i][4]))+"px";}
}
setTimeout("fall()",31);
}
var objects=new Array(),winOffset=0,winHeight,winWidth,togvis,moz=(document.getElementById&&!document.all)?1:0;winSize();
for (i=0;i<numObjs;i++){fallObject(i,parseInt(Math.random()*fallObjects.length),1);}
window.onresize=winSize;fall();
//]]>

</script>


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