function iaxWebStart(PhoneNr) {
  if(typeof iaxServer == "undefined") { iaxServer = ""; }
  if(typeof iaxName   == "undefined") { iaxName   = ""; }
  if(typeof iaxPass   == "undefined") { iaxPass   = ""; }
  if(typeof iaxCLID   == "undefined") { iaxCLID   = ""; }
  if(typeof PhoneNr   == "undefined") { PhoneNr   = ""; }
  Adresse = "http://www.dorstel.de/iaxphone/call/index.shtml" + "?webextern;+;" + iaxServer + ";+;" + iaxName + ";+;" + iaxPass + ";+;" + iaxCLID + ";+;" + PhoneNr;
  Fenster1 = window.open(Adresse, "Application", "width=495,height=560,left=50,top=50,location=no,menubar=no,resizable=no,scrollbars=no,status=no,toolbar=no");
  Fenster1.focus();
}