if (document.images)
{
 	    var biography_ov = new Image();
		biography_ov.src = "/images/com/nav/biography_ov.gif";
		var biography_off = new Image();
		biography_off.src = "/images/com/nav/biography_off.gif";
		
		var portfolio_ov = new Image();
		portfolio_ov.src = "/images/com/nav/portfolio_ov.gif";
		var portfolio_off = new Image();
		portfolio_off.src = "/images/com/nav/portfolio_off.gif";
		
				
		var galleries_ov = new Image();
		galleries_ov.src = "/images/com/nav/galleries_ov.gif";
		var galleries_off = new Image();
		galleries_off.src = "/images/com/nav/galleries_off.gif";
		
				
		var collections_ov = new Image();
		collections_ov.src = "/images/com/nav/collections_ov.gif";
		var collections_off = new Image();
		collections_off.src = "/images/com/nav/collections_off.gif";
		
				
		var articles_ov = new Image();
		articles_ov.src = "/images/com/nav/articles_ov.gif";
		var articles_off = new Image();
		articles_off.src = "/images/com/nav/articles_off.gif";
		
				
		var contact_ov = new Image();
		contact_ov.src = "/images/com/nav/contact_ov.gif";
		var contact_off = new Image();
		contact_off.src = "/images/com/nav/contact_off.gif";
}

function img_ov(imgname)
{
        if (document.images) {
               document[imgname].src = eval(imgname + "_ov.src"); 
        }
}

function img_off(imgname)
{
        if (document.images) {
			   document[imgname].src = eval(imgname + "_off.src");
		}
}