var jshover = function()
{
        var menuDiv = document.getElementById("left_menu");
        if (!menuDiv)
                return;

  var nodes = menuDiv.getElementsByTagName("li");
  for (var i=0; i<nodes.length; i++)
  {
    nodes[i].onmouseover = function()
    {
      this.className += " jshover";
    }

    nodes[i].onmouseout = function()
    {
      this.className = this.className.replace(new RegExp(" jshover\\b"), "");
    }
  }
}

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