// navigation images 
var nav_services_off = new Image();
nav_services_off.src = 'images/nav_services.gif';
var nav_services_over = new Image();
nav_services_over.src = 'images/nav_services_over.gif';

var nav_about_off = new Image();
nav_about_off.src = 'images/nav_about.gif';
var nav_about_over = new Image();
nav_about_over.src = 'images/nav_about_over.gif';

var nav_newsletter_off = new Image();
nav_newsletter_off.src = 'images/nav_news.gif';
var nav_newsletter_over = new Image();
nav_newsletter_over.src = 'images/nav_news_over.gif';

var nav_faq_off = new Image();
nav_faq_off.src = 'images/nav_faq.gif';
var nav_faq_over = new Image();
nav_faq_over.src = 'images/nav_faq_over.gif';

var nav_contact_off = new Image();
nav_contact_off.src = 'images/nav_contact.gif';
var nav_contact_over = new Image();
nav_contact_over.src = 'images/nav_contact_over.gif';


function rollOn(imgname) {
	if (imgname == "") {
		return;	
	}
	if (document.images) {
	  	document.images[imgname].src = eval(imgname + '_over.src');
  	} 
}
    
function rollOff(imgname) {
	if (imgname == "") {
		return;	
	}
	if (document.images) {
  		document.images[imgname].src = eval(imgname + '_off.src');
  	} 
}