menuHover = function() {

  var elems = document.getElementById("menu").getElementsByTagName("DIV");
  
  for (var i=0; i<elems.length; i++) {
  
    if ( elems[i].className=="menu_item" ) {
      elems[i].onmouseover=function() {
        this.className+=" menuhover";
      }
      elems[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" menuhover\\b"), "");
      }
    }
    else if ( elems[i].className=="submenu_level_1" ) {
      elems[i].onmouseover=function() {
        this.className+=" menuhover_2";
      }
      elems[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" menuhover_2\\b"), "");
      }
    }
    else if ( elems[i].className=="submenu_level_2" ) {
      elems[i].onmouseover=function() {
        this.className+=" menuhover_3";
      }
      elems[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" menuhover_3\\b"), "");
      }
    }
    else if ( elems[i].className=="submenu_level_3" ) {
      elems[i].onmouseover=function() {
        this.className+=" menuhover_4";
      }
      elems[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" menuhover_4\\b"), "");
      }
    }
    else if ( elems[i].className=="submenu_level_4" ) {
      elems[i].onmouseover=function() {
        this.className+=" menuhover_5";
      }
      elems[i].onmouseout=function() {
        this.className=this.className.replace(new RegExp(" menuhover_5\\b"), "");
      }
    }
    
 }
}

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