function popupImage(file,width,height)
{
    var x = (screen.availWidth - width)/2;
    var y = (screen.availHeight - height)/2;
    
    var win = window.open("galerie.htm?file="+file,"popup","width="+width+",height="+height+",left="+x+",top="+y+"");
    win.focus();
}

var popup = null;

/**
 * Popup wieder schließen
 *
 * @access public
 */
function popdown()
{
  if (popup && !popup.closed)
  {
      popup.close();
  }
}

/**
 * Popup erstellen und öffnen
 *
 * @param obj
 * @param int w
 * @param int h
 * @access public
 */
function doPopup(url, width, height)
{
    var args = 'width=' + width + ',height=' + height + ',resizable, scrollbars=yes';
    //popdown();
    popup = window.open(url, '', args);
    //return (popup) ? false : true;
}

window.onunload = popdown;
window.onfocus = popdown;