function rollOver(obj)
{
	var _src = obj.src.toString();
	var newSrc = _src.replace(/.jpg/i,"_roll.jpg");
	obj.src=newSrc;

}

function rollOut(obj)
{
	var _src = obj.src.toString();
	var newSrc = _src.replace(/_roll.jpg/i,".jpg");
	obj.src=newSrc;
}