function  togglesubnav(){
		if (document.getElementById("sub1").className=="menuhidden") {
			document.getElementById("sub1").className="submenushow";
			document.getElementById("sub2").className="submenushow";
			document.getElementById("sub3").className="submenushow";
			}
		else {
			document.getElementById("sub1").className="menuhidden";
			document.getElementById("sub2").className="menuhidden";
			document.getElementById("sub3").className="menuhidden";
			}		
		}