var num=0;
  var id;
  function st(){
		num=num+1;
		if(num==5){
			if(confirm("请确认进入后台管理页面")){
				window.open("Manage/manage.asp","","");
				return;
			}else{
				return;
			}
		}
		id=setTimeout(st,1000);
	}
	function ed(){
			clearTimeout(id);
			num=0;
		}