sfHover = function() {
    var sfEls = document.getElementById("nav").getElementsByTagName("LI");
    for (var i=0; i<sfEls.length; i++) {
        sfEls[i].onmouseover=function() {
            this.className+=" sfhover";
        if(document.getElementById("menu_iframe")) {
          var iframe = document.getElementById("menu_iframe");

          var submenu = this.getElementsByTagName("UL");
          if(submenu.length) {
            iframe.style.top = submenu[0].offsetTop + this.offsetTop;
            iframe.style.left = submenu[0].offsetLeft + this.offsetLeft;
            iframe.style.width = submenu[0].scrollWidth;
            iframe.style.height = submenu[0].clientHeight;
            iframe.style.display = "inline";
          }
        }

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

        if(document.getElementById("menu_iframe")) {
          var iframe = document.getElementById("menu_iframe");
          iframe.style.display = "none";
        }

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