function basketOverview() {
	var url = 'http://www.oetinger.de/nc/einkaufswagen/einkaufswagen.html';
	return openBasketWindow(url);
}

function basketAdd(isbn) {
	var url = 'http://www.oetinger.de/nc/einkaufswagen/einkaufswagen-add.html?tx_zsctemparticles_pi1[art_no]=' + isbn;
	return openBasketWindow(url);
}

function openBasketWindow(url) {
	var myWin = window.open(url, 'warenkorb', 'width=980, height=640, scrollbars=yes');
	myWin.focus();
	return myWin;
}