function findimg()
	{
		var imgs,i;
	// Loop through all images, and check if their classes contain the class roll
		imgs=document.getElementsByTagName('img');
		for(i=0;i<imgs.length;i++)
		{
			if(/roll/.test(imgs[i].className))
			{
	// add the function roll to the parent Element of the image
				imgs[i].parentNode.onmouseover=function(){roll(this);};
				imgs[i].parentNode.onmouseout=function(){roll(this);};
				imgs[i].parentNode.onfocus=function(){roll(this);};
				imgs[i].parentNode.onblur=function(){roll(this);};
			}
		}
	}
	function roll(o)
	{
		var i,isnode,src,ftype,newsrc,nownode;
	// loop through all childNodes
		for (i=0;i<o.childNodes.length;i++)
		{
			nownode=o.childNodes[i];
	// if the node is an element and an IMG set the variable and exit the loop
			if(nownode.nodeType==1 && /img/i.test(nownode.nodeName))
			{
				isnode=i;
				break;
			}
		}
	// check src and do the rollover
		src = o.childNodes[isnode].src;
		ftype = src.substring(src.lastIndexOf('.'), src.length);
		if(/_on/.test(src))
		{
			newsrc = src.replace('_on','');
		}else{
			newsrc = src.replace(ftype, '_on'+ftype);
		}
		o.childNodes[isnode].src=newsrc;
	}
	
	window.onload=function(){
		findimg();
	}