function showmenu(elmnt)
{
   var obj = document.getElementById(elmnt);
   if(obj!=null)
    obj.style.visibility="visible";
}
function hidemenu(elmnt)
{
    var obj = document.getElementById(elmnt);
       if(obj!=null)
        obj.style.visibility="hidden";
}
function toggle_visibility(elmnt) {
      var obj = document.getElementById(elmnt);
      var ar = document.getElementById("primarynavigation").getElementsByTagName("ul");
       if(obj!=null) {
        if(obj.style.visibility == "hidden"){
          for (var i=0; i<ar.length; i++){
				if (ar[i].className=="submenu") 
				ar[i].style.visibility = "hidden";
			}
			          obj.style.visibility = "visible";

          }
        else{
          obj.style.visibility = "hidden";
       }
}
}