startList = function() {
   if (document.all&&document.getElementById) {
      navRoot = document.getElementById("menu");
      for (i=0; i<navRoot.childNodes.length; i++) {
         node = navRoot.childNodes[i];
         if (node.nodeName=="LI") {
            node.onmouseover=function() {
               this.className+=" over";
               EscondeCombo();
               }
            node.onmouseout=function() {
               this.className=this.className.replace
               (" over", "");
               MostraCombo();
               }
            }
         }
      }
   }

function MostraCombo()
{
 qtdSelect = document.getElementsByTagName("select");
 for (i = 0; i < qtdSelect.length; i++)
 {
    objSelect = qtdSelect[i];
    objSelect.style.visibility = "visible";
  }
}
function EscondeCombo()
{
 qtdSelect = document.getElementsByTagName("select");
 for (i = 0; i < qtdSelect.length; i++)
 {
   objSelect = qtdSelect[i];
   objSelect.style.visibility = "hidden";
 }
}

window.onload=startList;