window.onload=rolloverInit;
function rolloverInit()
{
	    var   nav=document.getElementById("nav");
		  var   imgs=nav.getElementsByTagName("img");  
		  
	for (var i=0;i<imgs.length;i++)
   { 
	  if (imgs[i].parentNode.tagName=="A" )
     {
	  setupRollover(imgs[i]);
	 }
	 
   }
}
function setupRollover(thisImage)
{
	thisImage.outImage=new Image();
	thisImage.outImage.src=thisImage.src;
	thisImage.onmouseout=rollOut;
	
	thisImage.overImage=new Image();
	thisImage.overImage.src="nav/"+thisImage.id+"_2.jpg";
	thisImage.onmouseover=rollOver
}
function rollOver(){
	this.src= this.overImage.src;
}
function rollOut(){
	this.src=this.outImage.src;
}