function checkmenu(o){
	for(var i=1;i<=4;i++){
		var id="nav"+i;
		var e=document.getElementById("sub"+i);
		var j=document.getElementById(id);
		if(i!=o){
			j.className="nav_current";
		    e.style.display = "none";
			}else{
			j.className="In_current";
			e.style.display = "block";	
				}
		}
		if (o>4){
			document.getElementById("sub"+o).style.display = "block";
			}else{
			//document.getElementById("sub"+o).style.display = "none";	
				}
				//alert(o);
	}