blobs in a jar

<script type="text/javascript">
// <![CDATA[
var colour="#00CCFF"; // what colour are the blobs
var speed=66; // speed of animation, lower is faster
var blobs=20; // how many blobs are in the jar
var charc=String.fromCharCode(9679); // a blob - can be changed to charc='hello' or charc='*' for a different effect

/***************************\
*   Blobs in a Jar Effect   *
* (c)2012 mf2fm web-design  *
*  http://www.mf2fm.com/rv  *
* DON'T EDIT BELOW THIS BOX *
\***************************/

window.onload=fill_the_jar;
var div;
var xpos=new Array();
var ypos=new Array();
var zpos=new Array();
var dx=new Array();
var dy=new Array();
var dz=new Array();
var blob=new Array();
var swide=800;
var shigh=600;
function fill_the_jar() {
var i, dvs;
div=document.createElement('div');
dvs=div.style;
dvs.position='fixed';
dvs.left='0px';
dvs.top='0px';
dvs.width='1px';
dvs.height='1px';
document.body.appendChild(div);
set_width();
for (i=0; i<blobs; i++) {
 add_blob(i);
 jamjar(i);
}
}

function add_blob(ref) {
var dv, sy;
dv=document.createElement('div');
    dv.appendChild(document.createTextNode(charc));
sy=dv.style;
sy.position='absolute';
sy.textAlign="center";
    if (navigator.appName=="Microsoft Internet Explorer") {
 sy.fontSize="10px";
 sy.width="100px";
 sy.height="100px";
 sy.paddingTop="40px";
 sy.color=colour;
}
else sy.color='rgba(0,0,0,0)';
  ypos[ref]=Math.floor(shigh*Math.random());
dy[ref]=(0.5+Math.random())*(Math.random()>.5?2:-2);
xpos[ref]=Math.floor(swide*Math.random());
dx[ref]=(0.5+Math.random())*(Math.random()>.5?2:-2);
zpos[ref]=Math.random()*20;
dz[ref]=(0.5+Math.random())*(Math.random()>.5?.5:-.5);
blob[ref]=dv;
div.appendChild(blob[ref]);
set_blob(ref);
}
function rejig(ref, xy) {
  if (xy=='y') {
dx[ref]=(0.5+Math.random())*sign(dx[ref]);
    dy[ref]=(0.5+Math.random())*-sign(dy[ref]);
  }
  else {
    dx[ref]=(0.5+Math.random())*-sign(dx[ref]);
  dy[ref]=(0.5+Math.random())*sign(dy[ref]);
  }
}
function sign(a) {
  if (a<0) return (-2);
  else if (a>0) return (2);
  else return (0);
}
function set_blob(ref) {
var sy;
sy=blob[ref].style;
sy.top=ypos[ref]+'px';
sy.left=xpos[ref]+'px';
    if (navigator.appName=="Microsoft Internet Explorer") {
 sy.filter="glow(color="+colour+",strength="+zpos[ref]+")";
 sy.fontSize=30-zpos[ref]+"px";
}
else {
 sy.textShadow=colour+' 0px 0px '+zpos[ref]+'px';
 sy.fontSize=40+zpos[ref]+'px';
}
}
function jamjar(ref) {
if (ypos[ref]+dy[ref]<-50 || ypos[ref]+dy[ref]>shigh) rejig(ref, 'y');
ypos[ref]+=dy[ref];
if (xpos[ref]+dx[ref]<-50 || xpos[ref]+dx[ref]>swide) rejig(ref, 'x');
xpos[ref]+=dx[ref];
if (zpos[ref]+dz[ref]<0 || zpos[ref]+dz[ref]>20) dz[ref]=-dz[ref];
zpos[ref]+=dz[ref];
set_blob(ref);
setTimeout("jamjar("+ref+")", speed);
}

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)!="undefined" && 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;
}
// ]]>
</script>