// funkcja do rozwijanego menu
   sfHover = function() {
	   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 (window.attachEvent) window.attachEvent("onload", sfHover);