var nav_home_off = new Image();
nav_home_off.src = '../images/nav_home.gif';
var nav_home_over = new Image();
nav_home_over.src = '../images/nav_home_over.gif';

var nav_books_off = new Image();
nav_books_off.src = 'images/nav_books.gif';
var nav_books_over = new Image();
nav_books_over.src = 'images/nav_books_over.gif';

var nav_custom_off = new Image();
nav_custom_off.src = 'images/nav_custom.gif';
var nav_custom_over = new Image();
nav_custom_over.src = 'images/nav_custom_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_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');
  	} 
}

var newwindow;
function amazonPopup(url)
{
	newwindow=window.open(url,'name','height=500,width=800,left=100,top=100,resizable=yes,scrollbars=yes,toolbar=yes,status=yes');
	if (window.focus) {newwindow.focus()}
}