snHover = function() {
  if (document.getElementById("mainNav"))
  {
    debugString = "";
    var sfEls = document.getElementById("mainNav").getElementsByTagName("LI");
    for (var i=0; i<sfEls.length; i++)
    {
      if(sfEls[i].id.substr(0,4) == "lev1")
      {
        sfEls[i].onmouseover=function() {
          this.className+=" snHover";
        }
        sfEls[i].onmouseout=function() {
          this.className=this.className.replace(new RegExp(" snHover\\b"), "");
        }
      }
      else
      {
        sfEls[i].onmouseover=function() {
          this.className+=" soHover";
        }
        sfEls[i].onmouseout=function() {
          this.className=this.className.replace(new RegExp(" soHover\\b"), "");
        }
      }
    }
  }
}
if (window.attachEvent) window.attachEvent("onload", snHover);