kal = function() {
var sfEls = document.getElementById("nav").getElementsByTagName("LI");
for (var i=0; i<sfEls.length; i++) {
   sfEls[i].onmouseover=function() { this.className+=" kal"; }
   sfEls[i].onmouseout=function() {this.className=this.className.replace(new RegExp(" kal\\b"), "");}
}
}
if (window.attachEvent) window.attachEvent("onload", kal);