sfHover = function() {
  var BUA = navigator.userAgent;
  var BIE = BUA.indexOf("MSIE");
  var BIsIE = BIE>=0;
  var sfEls = document.getElementById("nav").getElementsByTagName("LI");

  for (var i=0; i<sfEls.length; i++) {
    sfEls[i].onmouseover=function() {
    this.className+=" sfhover";
    }
    sfEls[i].onmouseout=function() {
    this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
    }

    //If we're using IE then this tells any first level item to have a width of 1px
    if (sfEls[i].parentNode == document.getElementById("site_nav") && BIsIE) {
    sfEls[i].style.width = '1px';
    }
  }
}

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