function showRoute(start_adresse, end_adresse)
{
  var url = "http://maps.google.de/maps?f=d&source=s_d&saddr=START&daddr=ZIEL&hl=de&mra=ls&ie=UTF&oe=UTF8&z=10";

  url = url.replace(/START/, escape(start_adresse));
  url = url.replace(/ZIEL/, escape(end_adresse));
  window.open(url);
}