function showMenu(obj)
{
 //var span = findNodeByIdx(obj.childNodes, 1);
 //span.className = "on";
 obj.className = "on";
// var div = findNodeByIdx(obj.childNodes, 2);
// div.className.display = "block";
 }
 function closeMenu(obj)
 {
// var div = findNodeByIdx(obj.childNodes, 2);
// div.style.display = "none";
 //var span = findNodeByIdx(obj.childNodes, 1);
 //span.className = "";
 obj.className = "";
 }