falling snowflakes mf2fm

<script type="text/javascript">
// <![CDATA[
var speed=40; // lower number for faster
var flakes=33; // number of flakes falling at a time
var untidy=8; // how often do you want the flakes tidied up (high number is less often)
var sizes=36; // maximum size of flakes in pixels
var colour='#f7f7f7'; // colour of the snowflakes

/****************************\
*Winter Snow Flakes Effect #3*
*  (c)2013 mf2fm web-design  *
*  http://www.mf2fm.com/rv   *
* DO NOT EDIT BELOW THIS BOX *
\****************************/

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var dx=new Array();
var xp=new Array();
var yp=new Array();
var am=new Array();
var dy=new Array();
var le=new Array();
var fs=new Array();
var flaky=new Array();
var swide=480;
var shigh=320;
var sleft=0;
var starty=0;
var offset=0;
var tidying=0;
var deeex=0;
var has_focus=true;
var snowflakes=new Array(8727, 10016, 10033, 10035, 10036, 10037, 10038, 10042, 10043, 10044, 10045, 10046, 10051, 10052, 10053, 10054, 10055, 10056, 10057, 10058, 10059);
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  boddie.style.backgroundColor="transparent";
  boddie.style.pointerEvents="none";
  boddie.style.zIndex="0";
  document.body.insertBefore(boddie, document.body.firstChild);
  set_width();
  plow.style.position="absolute";
  plow.style.overflow="hidden";
  plow.style.zIndex=9999;
  plow.style.bottom="0px";
  plow.style.left="-144px";
  boddie.appendChild(plow);
  for (i=0; i<flakes; i++) freeze_ice(Math.random()*shigh*3/4);
  offset=0;
  setInterval("winter_flakes()", speed);
}}

function freeze_ice(whyp) {
  starty++;
  offset++;
  var f, t;
  start_fall(starty, whyp);
  f=document.createElement("div");
  t=document.createTextNode(String.fromCharCode(snowflakes[starty%snowflakes.length]));
  f.appendChild(t);
  t=f.style;
  t.color=colour;
  if (ie_version && ie_version<10) t.filter="glow(color="+colour+",strength=1)";
  else if (ie_version) t.boxShadow="0px 0px 2x 2px "+colour;
  else t.textShadow=colour+' 0px 0px 2px';
  t.font=fs[starty]+"px sans-serif";
  t.position="absolute";
  t.zIndex=1000+starty;
  t.top=yp[starty]+"px";
  t.left=xp[starty]+"px";
  t.lineHeight=fs[starty]+"px";
  flaky[starty]=f;
  boddie.appendChild(f);
}

function start_fall(i, whyp) {
  fs[i]=Math.floor(sizes*(.25+.75*Math.random()));
  dx[i]=Math.random();
  am[i]=8+Math.random()*sizes*.75;
  dy[i]=1+Math.random()*2;
  xp[i]=Math.random()*(swide-fs[i]);
  yp[i]=whyp-fs[i];
  le[i]='falling';
}

function set_width() {
  var sw, sh;
  if (typeof(window.innerWidth)=='number' && window.innerWidth) {
    sw=window.innerWidth;
    sh=window.innerHeight;
  }
  else if (document.compatMode=="CSS1Compat" && document.documentElement && document.documentElement.clientWidth) {
    sw=document.documentElement.clientWidth;
    sh=document.documentElement.clientHeight;
  }
  else {
    sw=document.body.clientWidth;
	sh=document.body.clientHeight;
  }
  if (sw && sh && has_focus) {
    swide=sw;
    shigh=sh;
  }
  boddie.style.height=shigh+"px";
}

function winter_flakes() {
  var i;
  var c=0;
  for (i=0; i<starty; i++) {
    if (flaky[i] && le[i]!='tidying') {
		if (yp[i]>shigh || xp[i]>swide || xp[i]<-fs[i]) {
		  if (offset>0) offset--;
		  boddie.removeChild(flaky[i]);
		  flaky[i]=false;
		}
		else if (yp[i]+offset/flakes<shigh-0.7*fs[i]) {
		  yp[i]+=dy[i];
		  dx[i]+=0.02+Math.random()/20;
		  xp[i]+=deeex;
		  flaky[i].style.top=yp[i]+"px";
		  flaky[i].style.left=(xp[i]+am[i]*Math.sin(dx[i]))+"px";
		}
		else if (le[i]=='falling') le[i]='landed';
	}
	if (flaky[i] && le[i]=='falling') c++;
  }
  if (c<flakes) freeze_ice(0);
  if (offset>untidy*flakes && !tidying && Math.random()<.05) tidy_flakes();
}

function tidy_flakes() {
  var i;
  tidying=true;
  for (i=swide; i>=-146; i-=2) setTimeout('plough('+i+')', speed*(swide-i));
  setTimeout('tidying=false; offset=0;', speed*(swide-i));
}

function plough(x) {
  var i, p;
  plow.style.left=x+"px";
  for (i=0; i<starty; i++) {
    if (flaky[i] && le[i]!='falling') {
	  p=xp[i]+fs[i]+am[i]*Math.sin(dx[i])-dy[i];
	  if (p<0) {
	    boddie.removeChild(flaky[i]);
		flaky[i]=false;
	  }
	  else if (p>x && p<x+3.5) {
	    le[i]='tidying';
	    xp[i]-=2;
	    if (Math.random()<.1) {
		  yp[i]--;
		  flaky[i].style.top=yp[i]+"px";
	    }
	    flaky[i].style.left=(xp[i]+am[i]*Math.sin(dx[i]))+"px";
	  }
	  else if (p>x+144 && yp[i]<shigh-0.7*fs[i]) {
  	    yp[i]+=dy[i];
		dx[i]+=0.02+Math.random()/10;
		flaky[i].style.top=yp[i]+"px";
		flaky[i].style.left=(xp[i]+am[i]*Math.sin(dx[i]))+"px";
	  }
	}
  }
}

function set_scroll() {
  if (typeof(self.pageXOffset)=='number' && self.pageXoffset) sleft=self.pageXOffset;
  else if (document.body && document.body.scrollLeft) sleft=document.body.scrollLeft;
  else if (document.documentElement && document.documentElement.scrollLeft) sleft=document.documentElement.scrollLeft;
  else sleft=0;
}

function mouse(e) {
  var x;
  if (e) x=e.pageX;
  else {
	x=event.x;
    set_scroll();
    x+=sleft;
  }
  deeex=has_focus?Math.floor(-1+3*(x-sleft)/swide):0;
}
// ]]>
</script>