if (document.images) {
	//nav
	presentation2 = new Image();
	presentation2.src = "img/nav/presentation_over.gif";
	presentation1 = new Image();
	presentation1.src = "img/nav/presentation.gif";
	
	collections2 = new Image();
	collections2.src = "img/nav/collections_over.gif";
	collections1 = new Image();
	collections1.src = "img/nav/collections.gif";
	
	ordering2 = new Image();
	ordering2.src = "img/nav/ordering_over.gif";
	ordering1 = new Image();
	ordering1.src = "img/nav/ordering.gif";
	
	contact2 = new Image();
	contact2.src = "img/nav/contact_over.gif";
	contact1 = new Image();
	contact1.src = "img/nav/contact.gif";
	
	//nav collections
	new_col2 = new Image();
	new_col2.src = "img/collections/new_collection_over.gif";
	new_col1 = new Image();
	new_col1.src = "img/collections/new_collection.gif";
	
	previous_col2 = new Image();
	previous_col2.src = "img/collections/previous_collections_over.gif";
	previous_col1 = new Image();
	previous_col1.src = "img/collections/previous_collections.gif";		
}
function rollOn(n) {
	if (document.images) {
		light=eval(n+"2.src");
		document [n].src=light;
	}
}
function rollOff(n) {
	if (document.images) {
		dark=eval(n+"1.src");
		document [n].src=dark;
	}
}