This javascript allows a bursting fireworks show effect that will show upon viewer entering page with this code inserted.

Insert this code into your HEAD of HTML

<!-- This Code Free From http://www.DesignerWiz.com Javascript Public Archive Library --> <SCRIPT LANGUAGE="JavaScript1.2"> <!-- /* Document firework script (By Matt Gabbert, mgabbert@usrtoday.com, http://www.nolag.com) Permission granted to DesignerWiz.com to feature script in archive For full source and 100's more Javascripts, visit http://www.DesignerWiz.com */ //set Interval between each firework display, var intervals=2000 var sparksOn = true; var speed = 40; var power = 3; //Dont change these values------- var documentWidth=documentHeight=randomx=randomy=leftcorner=topcorner=0 var ns=(document.layers); var ie=(document.all); var ns6=(document.getElementById&&!document.all); var sparksAflyin = false; var allDivs = new Array(10); var totalSparks = 0; //------------------------------- function initAll(){ if(!ns && !ie &&!ns6){ sparksOn = false; return; } setInterval("firework()",intervals) if (ns) document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE); for(dNum=0; dNum<7; ++dNum){ if(ie) allDivs[dNum]=eval('document.all.sDiv'+dNum+'.style'); else if (ns6) allDivs[dNum]=document.getElementById('sDiv'+dNum).style; else allDivs[dNum]=eval('document.layers["sDiv'+dNum+'"]'); } } function firework(){ //below code detects the browser dimenions if (ie){ documentWidth=document.body.clientWidth documentHeight=document.body.clientHeight leftcorner=document.body.scrollLeft topcorner=document.body.scrollTop } else if (ns||ns6){ documentWidth=window.innerWidth documentHeight=window.innerHeight leftcorner=pageXOffset topcorner=pageYOffset } //below code randomly generates a set of coordinates that fall within the dimension randomx=leftcorner+Math.floor(Math.random()*documentWidth) randomy=topcorner+Math.floor(Math.random()*documentHeight) if(sparksOn){ if(!sparksAflyin){ sparksAflyin=true; totalSparks=0; for(var spark=0;spark<=6;spark++){ dx=Math.round(Math.random()*50); dy=Math.round(Math.random()*50); moveTo(spark,randomx,randomy,dx,dy); } } } } function moveTo(i,tempx,tempy,dx,dy){ if(ie){ if(tempy+80>(document.body.offsetHeight+document.body.scrollTop)) tempy=document.body.offsetHeight+document.body.scrollTop-80; if(tempx+80>(document.body.offsetWidth+document.body.scrollLeft)) tempx=document.body.offsetWidth+document.body.scrollLeft-80; } else if(ns6){ if(tempy+80>(window.innerHeight+pageYOffset)) tempy=window.innerHeight+pageYOffset-80; if(tempx+80>(window.innerWidth+pageXOffset)) tempx=window.innerWidth+pageXOffset-80; } if(tempx>-50&&tempy>-50){ tempx+=dx;tempy+=dy; allDivs[i].left=tempx; allDivs[i].top=tempy; dx-=power;dy-=power; setTimeout("moveTo("+i+","+tempx+","+tempy+","+dx+","+dy+")",speed) } else ++totalSparks if(totalSparks==7){ sparksAflyin=false; totalSparks=0; } } window.onload=initAll //End--> </script> <style> #sDiv0 {position:absolute; height:1; width:1; font-family:arial black; font-size:15px; color:Aqua; z-index:9;} #sDiv1 {position:absolute; height:1; width:1; font-family:arial black; font-size:15px; color:red; z-index:10;} #sDiv2 {position:absolute; height:1; width:1; font-family:arial black; font-size:15px; color:blue; z-index:11;} #sDiv3 {position:absolute; height:1; width:1; font-family:arial black; font-size:15px; color:orange; z-index:12;} #sDiv4 {position:absolute; height:1; width:1; font-family:arial black; font-size:15px; color:yellow; z-index:13;} #sDiv5 {position:absolute; height:1; width:1; font-family:arial black; font-size:15px; color:lightgreen; z-index:14;} #sDiv6 {position:absolute; height:1; width:1; font-family:arial black; font-size:15px; color:silver; z-index:15;} </style>

Insert this code into your BODY of HTML

<div id="sDiv0">*</div> <div id="sDiv1">*</div> <div id="sDiv2">*</div> <div id="sDiv3">*</div> <div id="sDiv4">*</div> <div id="sDiv5">*</div> <div id="sDiv6">*</div>

Simply Cut and Paste Script code
Be sure to properly place script position in Head & Body section of html 

Credit: Roberto de Jesus Asyn Diaz Homepage

This script has been in the DesignerWiz.com Public Library.