function initMenu() {
    var obj = document.getElementById("mainmenu");
    if (obj != null)
    {
  	  var childnodes=obj.children;
  	  for (var i = 0; i < childnodes.length; i++) {
  	      var child = childnodes[i];
  	      child.onmouseover = function() {
  	          if (this.getElementsByTagName("ul")[0]) {
  	              this.getElementsByTagName("ul")[0].style.display = "block";
  	          }
  	      };
  	      child.onmouseout = function() {
  	          if (this.getElementsByTagName("ul")[0]) {
  	              this.getElementsByTagName("ul")[0].style.display = "none";
  	          }
  	      };
  	  }
	}	  
}