var imgWnd;


function closeImgWnd() {
  if ((imgWnd != null) && (! imgWnd.closed)) {
    imgWnd.close();
  }
}

function openImgWnd(target) {
  imgWnd = window.open(target, 'Bilddetails', 
              'dependent=yes' +
              ',width=500'+
              ',height=450,'+
              'left=50,top=50');
  imgWnd.focus();
}