// JavaScript Document

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); 


//Basically, this applies the 'sfhover' class to li elements in the 'nav' id'd ul element when they are 'moused over' and removes it, using a regular expression, when 'moused out'.