function ImageArray() { 
	this.length = ImageArray.arguments.length; 
	
	for (var i = 0; i < this.length; i++) { 
		this[i] = new Image();
		this[i].src = ImageArray.arguments[i];
	} 
} 

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);}
else if (window.addEventListener) {window.addEventListener('load', sfHover, false);}
else {document.addEventListener('load', sfHover, false);}