Javascript Code: Three Color around Mouse

By this code you can see three color line dancing around your mouse pointer.
<!-- this script got from www.javascriptfreecode.com coded by: Kerixa Inc. -->
<body>
<script language="JavaScript">
var a_Colour="red";
var b_Colour="blue";
var c_Colour="green";
var Size=40;

//Alter nothing below !!

var YDummy=new Array(),XDummy=new Array(),xpos=0,ypos=0,ThisStep=0;step=0.03;
if (document.layers){
window.captureEvents(Event.MOUSEMOVE);
function nsMouse(evnt){
xpos = window.pageYOffset+evnt.pageX+6;
ypos = window.pageYOffset+evnt.pageY+16;
}
window.onMouseMove = nsMouse;
}
else if (document.all)
{
function ieMouse(){
xpos = document.body.scrollLeft+event.x+6;
ypos = document.body.scrollTop+event.y+16;
}
document.onmousemove = ieMouse;
}

function swirl(){
for (i = 0; i < 3; i++)
 { 
  YDummy[i]=ypos+Size*Math.cos(ThisStep+i*2)*Math.sin((ThisStep)*6);
  XDummy[i]=xpos+Size*Math.sin(ThisStep+i*2)*Math.sin((ThisStep)*6);
 }
ThisStep+=step;
setTimeout('swirl()',10);
}

var amount=10;
if (document.layers){
for (i = 0; i < amount; i++)
{
document.write('<layer name=nsa'+i+' top=0 left=0 width='+i/2+' height='+i/2+' bgcolor='+a_Colour+'></layer>');
document.write('<layer name=nsb'+i+' top=0 left=0 width='+i/2+' height='+i/2+' bgcolor='+b_Colour+'></layer>');
document.write('<layer name=nsc'+i+' top=0 left=0 width='+i/2+' height='+i/2+' bgcolor='+c_Colour+'></layer>');
}
}
else if (document.all){
document.write('<div id="ODiv" style="position:absolute;top:0px;left:0px">'
+'<div id="IDiv" style="position:relative">');
for (i = 0; i < amount; i++)
{
document.write('<div id=x style="position:absolute;top:0px;left:0px;width:'+i/2+';height:'+i/2+';background:'+a_Colour+';font-size:'+i/2+'"></div>');
document.write('<div id=y style="position:absolute;top:0px;left:0px;width:'+i/2+';height:'+i/2+';background:'+b_Colour+';font-size:'+i/2+'"></div>');
document.write('<div id=z style="position:absolute;top:0px;left:0px;width:'+i/2+';height:'+i/2+';background:'+c_Colour+';font-size:'+i/2+'"></div>');
}
document.write('</div></div>');
}
function prepos(){
var ntscp=document.layers;
var msie=document.all;
if (document.layers){
for (i = 0; i < amount; i++)
{
 if (i < amount-1) 
 {
 ntscp['nsa'+i].top=ntscp['nsa'+(i+1)].top;ntscp['nsa'+i].left=ntscp['nsa'+(i+1)].left;
 ntscp['nsb'+i].top=ntscp['nsb'+(i+1)].top;ntscp['nsb'+i].left=ntscp['nsb'+(i+1)].left;
 ntscp['nsc'+i].top=ntscp['nsc'+(i+1)].top;ntscp['nsc'+i].left=ntscp['nsc'+(i+1)].left;
 } 
else  
 {
 ntscp['nsa'+i].top=YDummy[0];ntscp['nsa'+i].left=XDummy[0];
 ntscp['nsb'+i].top=YDummy[1];ntscp['nsb'+i].left=XDummy[1];
 ntscp['nsc'+i].top=YDummy[2];ntscp['nsc'+i].left=XDummy[2];
 }
}
}
else if (document.all){
for (i = 0; i <  amount; i++)
{
 if (i < amount-1) 
 {
 msie.x[i].style.top=msie.x[i+1].style.top;msie.x[i].style.left=msie.x[i+1].style.left;
 msie.y[i].style.top=msie.y[i+1].style.top;msie.y[i].style.left=msie.y[i+1].style.left;
 msie.z[i].style.top=msie.z[i+1].style.top;msie.z[i].style.left=msie.z[i+1].style.left;
 } 
else 
 {
 msie.x[i].style.top=YDummy[0];msie.x[i].style.left=XDummy[0];
 msie.y[i].style.top=YDummy[1];msie.y[i].style.left=XDummy[1];
 msie.z[i].style.top=YDummy[2];msie.z[i].style.left=XDummy[2];
 }
}
}
setTimeout("prepos()",10);
}
function Start(){
swirl(),prepos()
}
window.onload=Start;
// -->
</script>
</body></body>
</html>
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Javascript Code: Three Color around Mouse

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