var navflag = 0;
		var navtimer = null;

		function updatenav() {
			if(navflag == 0) {
				document.getElementById("navsub1").style.visibility = 'hidden';
				document.getElementById("navsub2").style.visibility = 'hidden';
			}
		}
			
		function navover() {
			if(navflag == 0) {
				navflag = 1;
				document.getElementById("navsub1").style.visibility = 'visible';
				document.getElementById("navsub2").style.visibility = 'visible';
			}			
		}
		
		function navkeep() {
			if(navflag == 0) {
				navflag = 1;
			}			
		}
		
		function navout() {
			if(navflag == 1) {
				navflag = 0;
				if(navtimer != null) {
	   				clearTimeout(navtimer);
	   				navtimer = null;
	   			}
				navtimer = setTimeout("updatenav()", 400);
			}
		}
		
		function navforceout() {
			if(navtimer != null) {
				clearTimeout(navtimer);
				navtimer = null;
			}
			updatenav();
		}