function popup(title, imgSrc, imgWidth, imgHeight) {
var wndLeft = (screen.width / 2) - (imgWidth / 2);
var wndTop = (screen.height / 2) - (imgHeight / 2);
_w = window.open("about:blank", "_w", "width=" + imgWidth + ",height=" + imgHeight + ",top=" + wndTop + ",left=" + wndLeft);
var doc = _w.document;
doc.open();
doc.write('' + title + '');
doc.write('');
doc.write('
');
doc.write('');
doc.close();
_w.focus();
return false;
}