sfHover = function() {
    var sfEls = document.getElementById("top_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 (window.attachEvent) window.attachEvent("onload", sfHover);
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
  var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
  if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}