function showGallery(galleryId, imageId) 
{
    var winLeft = (screen.availWidth - 660) / 2;
    var winTop = (screen.availHeight - 525) / 2;
	win = window.open('http://www.bistum-wuerzburg.de/bwo/dcms/res/pages/image_gallery.html?f_gallery_id=' + galleryId + '&f_image_id=' + imageId, 'show_imagegallery',
		'width=660, height=525, top=' + winTop + ', left=' + winLeft + ', scrollbars=no, menubar=no');
	win.opener = self;
	win.focus();
}