home_top_on = new Image();
	home_top_on.src = "images/nav_home_on.gif";
	home_top_off = new Image();
	home_top_off.src = "images/nav_home_off.gif";

	home_bottom_on = new Image();
	home_bottom_on.src = "images/nav_home_on.gif";
	home_bottom_off = new Image();
	home_bottom_off.src = "images/nav_home_off.gif";

	about_top_on = new Image();
	about_top_on.src = "images/nav_about_on.gif";
	about_top_off = new Image();
	about_top_off.src = "images/nav_about_off.gif";

	about_bottom_on = new Image();
	about_bottom_on.src = "images/nav_about_on.gif";
	about_bottom_off = new Image();
	about_bottom_off.src = "images/nav_about_off.gif";
	
	books_top_on = new Image();
	books_top_on.src = "images/nav_books_on.gif";
	books_top_off = new Image();
	books_top_off.src = "images/nav_books_off.gif";

	books_bottom_on = new Image();
	books_bottom_on.src = "images/nav_books_on.gif";
	books_bottom_off = new Image();
	books_bottom_off.src = "images/nav_books_off.gif";
	
	very_best_top_on = new Image();
	very_best_top_on.src = "images/nav_very_best_on.gif";
	very_best_top_off = new Image();
	very_best_top_off.src = "images/nav_very_best_off.gif";

	very_best_bottom_on = new Image();
	very_best_bottom_on.src = "images/nav_very_best_on.gif";
	very_best_bottom_off = new Image();
	very_best_bottom_off.src = "images/nav_very_best_off.gif";
	
	contact_top_on = new Image();
	contact_top_on.src = "images/nav_contact_on.gif";
	contact_top_off = new Image();
	contact_top_off.src = "images/nav_contact_off.gif";

	contact_bottom_on = new Image();
	contact_bottom_on.src = "images/nav_contact_on.gif";
	contact_bottom_off = new Image();
	contact_bottom_off.src = "images/nav_contact_off.gif";
	
	site_index_top_on = new Image();
	site_index_top_on.src = "images/nav_site_index_on.gif";
	site_index_top_off = new Image();
	site_index_top_off.src = "images/nav_site_index_off.gif";

	site_index_bottom_on = new Image();
	site_index_bottom_on.src = "images/nav_site_index_on.gif";
	site_index_bottom_off = new Image();
	site_index_bottom_off.src = "images/nav_site_index_off.gif";
	
		
	window.onerror=null;
	function rollOn(imgName)
	{
		if(document.images) {
	    imgOn = eval(imgName + '_on.src');
	    document [imgName].src = imgOn;
		}
	}
	
	function rollOff(imgName)
	{
		if(document.images) {
	    imgOff = eval(imgName + '_off.src');
	    document [imgName].src = imgOff;
		}
	}