Fireworks

<SCRIPT language=JavaScript1.2>
  
/*
 
Document firework script (By Kurt Gregg, kurt.grigg@virgin.net)
 
Modified/ perm. granted to Dynamic Drive to feature script in archive
 
For full source and 100's more DHTML scripts, visit http://dynamicdrive.com
 
*/
 
 
 
var ns=document.layers?1:0
 
var ie4=document.all?1:0
 
var ns6=document.getElementById&&!document.all?1:0
 
 
 
amount=100;
 
if (ns){
 
for (i=0; i < amount; i++)
 
document.write("<LAYER NAME='nsstars"+i+"' LEFT=0 TOP=0 BGCOLOR='#666' CLIP='0,0,1,1'></LAYER>");
 
}
 
else if (ie4||ns6){
 
document.write("<div id='ieCov' style='position:absolute;top:0px;left:0px'>");
 
document.write("<div style='position:relative'>");
 
for (i=0; i < amount; i++)
 
document.write("<div id='iestars"+i+"' style='position:absolute;top:0px;left:0px;width:1;height:1;background:#ffffff;font-size:1;z-index:10'></div>");
 
document.write("</div></div>");
 
}
 
Clrs=new Array('ffffff','7afeda','e7878c','7b0d0d','ff80ff','7d5549','5d85d7','3f7d6b','ffffff')
 
sClrs=new Array('ddceb1','ddceb1','ddceb1','ddceb1','ddceb1')
 
Xpos=300;
 
Ypos=150;
 
initialStarColor='00ff00';
 
step=5;
 
currStep=0;
 
explosionSize=120;
 
function Fireworks(){
 
var WinHeight=(ns||ns6)?window.innerHeight-100:window.document.body.clientHeight-100;
 
var WinWidth=(ns||ns6)?window.innerWidth-100:window.document.body.clientWidth-100;
 
var Yscroll=(ns||ns6)?window.pageYOffset:document.body.scrollTop;
 
for (i=0; i < amount; i++){
 
if (ie4||ns6)
 
var layer=ns6?document.getElementById("iestars"+i).style : eval("iestars"+i).style;
 
else if (ns)
 
var layer=document.layers["nsstars"+i]
 
var randCol=Math.round(Math.random()*8);
 
var randSz=Math.round(Math.random()*2);
 
layer.top = Ypos + explosionSize*Math.sin((currStep+i*5)/3)*Math.sin(currStep/100)
 
layer.left= Xpos + explosionSize*Math.cos((currStep+i*5)/3)*Math.sin(currStep/100)
 
if (currStep < 110){
 
 if (ns){layer.bgColor=initialStarColor;layer.clip.width=1;layer.clip.height=1}
 
 else{layer.background=initialStarColor;layer.width=1;layer.height=1;layer.fontSize=1}
 
 }
 
else{
 
 if (ns){layer.bgColor=Clrs[randCol];layer.clip.width=randSz;layer.clip.height=randSz}
 
 else{layer.background=Clrs[randCol];layer.width=randSz;layer.height=randSz;layer.fontSize=randSz}
 
 }
 
}
 
if (currStep > 220) 
 
{
 
 currStep=0;
 
 Ypos = 50+Math.round(Math.random()*WinHeight)+Yscroll;
 
 Xpos = 50+Math.round(Math.random()*WinWidth);
 
 for (i=0; i < sClrs.length; i++)
 
  {
 
  var newIcol=Math.round(Math.random()*i);
 
  }
 
initialStarColor=sClrs[newIcol];
 
explosionSize=Math.round(80*Math.random()+100);
 
}
 
currStep+=step;
 
setTimeout("Fireworks()",20);
 
}
 
Fireworks();
 
// -->
 
</SCRIPT>