function menuhover(d,onid,n){
	var obj = document.getElementById(d);
	if (!obj) return;
	var list = obj.getElementsByTagName('li');
	var tab_title_obj = document.getElementById("tab_title");
	list[n].id=onid;
	tab_title_obj.innerHTML = tab_title[n];
	for(var i=0;i<list.length;i++){
		list[i].onmouseover = function(){
			list[n].id = onid+"_bak";
			tab_title_obj.innerHTML = tab_title[c(this)];
		};
		list[i].onmouseout = function(){
			list[n].id=onid;
			tab_title_obj.innerHTML = tab_title[n];
		};
	};
	function c(o){
		for(var i=0;i<list.length;i++){
			if (list[i]==o){
				return i;
				break;
			};
		};
	};
}