var catsWindow = null;
function showBigImage(img_id) {
	var url = '/img-crypton/' + img_id;
	if (catsWindow == null || catsWindow.closed) {
		catsWindow = window.open(url, 'catsWindow', 'width=800,height=600,resizable=yes');
	}
	catsWindow.location.href = url;
	catsWindow.focus();
}