if (document.getElementById){
   document.write('<style type="text/css">\n')
   document.write('.submenu{display: none;}\n')
   document.write('</style>\n')
}

function SwitchNodo(obj, image){
   if(document.getElementById){
      var el = document.getElementById(obj);
      var im = document.getElementById(image);
      if(el.style.display!="block") {
         el.style.display = "block";
         im.src = "images/nodeOpen.gif";
      } else {
         el.style.display = "none";
         im.src = "images/nodeClose.gif";
      }
   }
}