rain mf2fm

<script type="text/javascript">
// <![CDATA[
var speed=33; // lower number for faster
var drops=100; // number of 'drops'
var colour="#999"; // colour of drops (generally grey!)

/***************************\
*   Rainy Afternoon Effect  *
*(c)2011-13 mf2fm web-design*
*  http://www.mf2fm.com/rv  *
* DON'T EDIT BELOW THIS BOX *
\***************************/

var flks=new Array();
var flkx=new Array();
var flky=new Array();
var fldy=new Array();
var swide, shigh, boddie;
var ie_version=(navigator.appVersion.indexOf("MSIE")!=-1)?parseFloat(navigator.appVersion.split("MSIE")[1]):false;

function addLoadEvent(funky) {
  var oldonload=window.onload;
  if (typeof(oldonload)!='function') window.onload=funky;
  else window.onload=function() {
    if (oldonload) oldonload();
    funky();
  }
}

addLoadEvent(storm);

function storm() { if (document.getElementById) {
  var r1, r2;
  boddie=document.createElement("div");
  boddie.style.position="fixed";
  boddie.style.top="0px";
  boddie.style.left="0px";
  boddie.style.width="1px";
  boddie.style.height="1px";
  boddie.style.overflow="visible";
  boddie.style.backgroundColor="transparent";
  document.body.appendChild(boddie);
  set_width();
  for (var i=0; i<drops; i++) {
    flks[i]=createDiv(16, 2, "transparent");
    r1=createDiv(6, 2, colour);
    r1.style.top="10px";
    r1.style.left="0px";
    flks[i].appendChild(r1);
    r2=createDiv(10, 2, colour);
    r2.style.top="0px";
    r2.style.left="0px";
    if (ie_version && ie_version<10) r2.style.filter="alpha(opacity=25)";
    else r2.style.opacity=0.25;
    flks[i].appendChild(r2);
    flkx[i]=2*Math.floor(Math.random()*swide/2);
    flky[i]=Math.floor(Math.random()*shigh);
    fldy[i]=2+Math.floor(Math.random()*4);
    flks[i].style.left=flkx[i]+"px";
    flks[i].style.top=flky[i]+"px";
    boddie.appendChild(flks[i]);
  }
  setInterval("cats_and_dogs()", speed);
}}

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

window.onresize=set_width;
function set_width() {
  var sw_min=999999;
  var sh_min=999999;
  if (document.documentElement && document.documentElement.clientWidth) {
    sw_min=document.documentElement.clientWidth;
    sh_min=document.documentElement.clientHeight;
  }
  if (typeof(self.innerWidth)!="undefined" && self.innerWidth) {
    if (self.innerWidth<sw_min) sw_min=self.innerWidth;
    if (self.innerHeight<sh_min) sh_min=self.innerHeight;
  }
  if (document.body.clientWidth) {
    if (document.body.clientWidth<sw_min) sw_min=document.body.clientWidth;
    if (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-2;
  shigh=sh_min;
}

function cats_and_dogs(c) {
  var i, x, o=0;
  for (i=0; i<drops; i++) {
    flky[i]+=fldy[i];
    if (flky[i]>=shigh-16) {
	  flky[i]=-16;
	  fldy[i]=2+Math.floor(Math.random()*4);
	  flkx[i]=2*Math.floor(Math.random()*swide/2);
	  flks[i].style.left=flkx[i]+"px";
	}
	flks[i].style.top=flky[i]+"px";
  }
}
// ]]>
</script>