function bounceSearch() {
  var pat = "^http://www\\.google\\.\\w{2,3}.*q=.*(hermann|Fass|Faß)";
  regex = new RegExp( pat, "i" );
  if ( regex.test( document.referrer ) ) {
    history.go(-2);
    // document.location.href = "http://www.vonabiszet.de/error404.html";
  }
}