var active=''; // optional line 1: delete if you want multiple menus on at a time


function toggle(menu) { 

	if (menu!='' && menu!=null) {  
		if (document.layers==null) { 
		
		
			if (document.getElementById(menu).style.display=='none') {
				document.getElementById(menu).style.display='';
				active=menu;
				
				
			} else {
				document.getElementById(menu).style.display='none';
			
			}
		}
	}
}