function large(url, vertical){
width = vertical ? 400 : 600;
height = vertical ? 600 : 400;
var w = open('','displayWindow','width=' + width + ',height=' + height + ',status=no,resizable=yes,toolbar=no,scrollbars=no,menubar=no');
w.document.open();
w.document.write('Large picture
');
w.document.close();
}