function popupImage(popupUrl, imageUrl, width, height) {
    var win = window.open(popupUrl + "?" + imageUrl + "&" + width + "&" + height, 'image', 'resizable=1, height=' + height + ', width=' + width + ', directories = no, location = no, menubar = no, status = no, scrollbars = no');
    win.focus();
}