var tags=document.getElementById("product_class").getElementsByTagName("li");
function change(num){
	var lk = document.getElementById("product_more");
	for (var i=1; i<=tags.length;i++){
		var j=i-1;
		if(i==num) {
			tags[j].className="checked";
			document.getElementById("cont"+i).style.display="block";			
		}
		else {
			tags[j].className="";
			document.getElementById("cont"+i).style.display="none";
		}
	}
}
function getEvent(){
		var i=1;var j;
		for (i;i<=tags.length;i++){
			j=i-1;
			eval("tags[j].onmouseover=function (){change("+i+");nn="+i+"}")
		}
}
getEvent();
change(1);