if(document.images){
        //preload images with Height + width
       sitemapon = new Image(54,21); sitemapon.src = "/common/images/sitemap_on.jpg";
	   sitemapoff = new Image(54,21); sitemapoff.src = "/common/images/sitemap_off.jpg";
	   
	   linkson = new Image(40,21); linkson.src = "/common/images/links_on.jpg";
	   linksoff = new Image(40,21); linksoff.src = "/common/images/links_off.jpg";
	   
	   friarson = new Image(71,21); friarson.src = "/common/images/friars_on.jpg";
	   friarsoff = new Image(71,21); friarsoff.src = "/common/images/friars_off.jpg";
	 
}
function change(imageName,imageFile){
        if(!document.images) return;//Exit if not supported
        document.images[imageName].src = eval(imageFile + ".src");
}