function sendToFriend( url ) {
    newWin = window.open( url, 'SendToFriend', 'height=600,width=450, scrollbars=yes, resizable=yes, dependent=yes' );
    newWin.focus();
    return false;
}

function hide_simulation( wert ) {
  window.open('../static/html/popup_spenden.htm','spenden','ontop=0,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,width=300,height=180');
  window.location.href = dateiselbst;
}