showMenu = function() {


  var subMenuItems = document.getElementById("topMenu").getElementsByTagName("li");


  for (var i=0; i<subMenuItems.length; i++) {


    subMenuItems[i].onmouseover=function() {


      this.className+=" showMenu";


    }


    subMenuItems[i].onmouseout=function() {


      this.className=this.className.replace(new RegExp(" showMenu\\b"), "");


    }


  }


}


 

if (window.attachEvent) window.attachEvent("onload", showMenu);