var active_id   = "0";
        var main_switch = "off";
        
        function menu(id,num){
            if(num==1){
                main_switch	= "on";
                if(active_id!= 0){
                    document.getElementById(active_id).style.display = "none";
                }
					document.getElementById("submenu").style.visibility = "hidden";
					document.getElementById(id).style.display = "block";
                active_id = id;
            }
            else {
                main_switch = "off";
            }
        }
        
        function verstoppen(){
            if( (active_id!=0) && (main_switch=="off")){
                document.getElementById(active_id).style.display="none";
				document.getElementById("submenu").style.visibility = "visible";
                clearTimeout(v);
            }
            main_switch=="off";
            var v=setTimeout("verstoppen()",10);
        }
        
        window.onload=function(){
            var v=setTimeout("verstoppen()",10);
        }