initMenu = function(menuId) {
  var sfEls = document.getElementById(menuId).getElementsByTagName("LI");
	      
  for (var i=0; i<sfEls.length; i++) {
    //set the mouseover function
    sfEls[i].onmouseover=function() {
	  this.className = "menu_hover";
    }
		    
    //set the mouce out function
    sfEls[i].onmouseout=function() {
      this.className = "";
	}
  }
}