Скрипт "Падающий снег"

<div onclick="stopsnow()" id="snow-start">Выкл. снег</div>
<script type="text/javascript">
  var snowsrc="http://all-blogspot.com/blog/img/snow.png";
  var no = 20;
  var log = 0;
  var hidesnowtime = 0;
  var snowdistance = "windowheight";

  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;   
  var am, stx, sty; 
  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("all-blogspot.com")!= 1)? "http://all-blogspot.com/blog/img/snow.png" : snowsrc
  for (i = 0; i < no; ++ i) { 
    dx[i] = 0;                       
    xp[i] = Math.random()*(doc_width-50);
    yp[i] = Math.random()*doc_height;
    am[i] = Math.random()*20;     
    stx[i] = 0.02 + Math.random()/10;
    sty[i] = 0.7 + Math.random();  
        if (ie4up||ns6up) {
      if (i == 0) {
        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: fixed; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
      } else {
        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: fixed; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
      }
    }
  }

  function snowIE_NS6() { 
    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) {
      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);
        }
 function stopsnow(){
 if (log==0){
  for (i=0; i<no; i++) document.getElementById("dot"+i).style.visibility="hidden";
  no = 0;
  log = 1;
  document.getElementById('snow-start').innerHTML ='Вкл. снег';
  }
  else { log = 0; no = 20; for (i=0; i<no; i++) document.getElementById("dot"+i).style.visibility="visible";
 document.getElementById('snow-start').innerHTML ='Выкл. снег';

  }

 }
</script>
<a id="copy" href="http://all-blogspot.com/"></a>
<style>
#snow-start{
background: rgba(27, 25, 25, 0.4);
color: #fff;
display: inline-block;
width: 100px;
text-align: center;
cursor: pointer;
line-height: 25px;
position: fixed;
right: 0px;
top: 0px;
border-radius: 0px 0px 0px 9px;
}
#copy{
color: rgba(20, 16, 16, 0);
font-size: 7px;
position: fixed;
text-decoration: none;
top: 24px;
right: 2px;
}

</style>