// Documento JavaScript Menu de navegacion para IE 6,7
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);