sfHover = function() {
 var sfEls = document.getElementById("nav").getElementsByTagName("LI");
 for (var i=0; i<sfEls.length; i++) {
  sfEls[i].onmouseover=function() {
   this.className+=" sfhover";
   // hide selects
   toggleSelects('hidden');
  }
  sfEls[i].onmouseout=function() {
   this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
   // show selects
   toggleSelects('visible');
  }
 }
}
if (window.attachEvent) window.attachEvent("onload", sfHover);
 
function toggleSelects(visibility)
{
 var selects = document.getElementById('content-wrapper').getElementsByTagName("select");
 var i = selects.length;
 while (i--)
  selects[i].style.visibility = visibility;
}