//preload rollover images
if (document.images) {
	home_over = new Image(226,38); 
	home_over.src="images/button_home_over.gif";
	about_over = new Image(226,38); 
	about_over.src="images/button_about_over.gif";
	labels_over = new Image(226,38); 
	labels_over.src="images/button_labels_over.gif";
	ordering_over = new Image(226,38); 
	ordering_over.src="images/button_ordering_over.gif";
	contact_over = new Image(226,38); 
	contact_over.src="images/button_contact_over.gif";
}