[bg] blur animation / cr. mf2fm web design

<script type="text/javascript">
// <![CDATA[
var colour="#ffffff"; // what colour are the blobs
var speed=50; // speed of animation, lower is faster
var blobs=30; // how many blobs are in the jar
var size=10; // maximum blob size
var charc='✿'; // 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>