function map24_removeDefaultValues() {
  if (document.getElementById('link2map24').sstreet.value == 'Straße') 	document.getElementById('link2map24').sstreet.value	= '';
	if (document.getElementById('link2map24').szip.value 	  == 'PLZ') 		document.getElementById('link2map24').szip.value 		= '';
	if (document.getElementById('link2map24').scity.value   == 'Ort') 		document.getElementById('link2map24').scity.value 	= '';
}

function checkContactForm() {
  var check_mail = new RegExp("^([0-9,a-z,A-Z]+)([.,_,-]([0-9,a-z,A-Z]+))*[@]([0-9,a-z,A-Z]+)([.,_,-]([0-9,a-z,A-Z]+))*[.]([0-9,a-z,A-Z]){2}([0-9,a-z,A-Z])*$");
  var check = true;
  var name = document.getElementById("contactform").name.value;
  var vorname = document.getElementById("contactform").vorname.value;
  var email = document.getElementById("contactform").email.value;
  var telefon = document.getElementById("contactform").telefon.value;
  var error = "";
  if (name.length == 0) error += "Bitte Namen angeben!\n";  
  if (vorname.length == 0) error += "Bitte Vornamen angeben!\n";  
  if (!(check_mail.test(email))) {
    error += "E-Mail-Adresse ist ungültig!\n"; 		
  }
  if (telefon.length == 0) error += "Bitte Telefonnummer angeben!\n";  

  if (error != "") {  // Fehler aufgetreten
 	  check = false;
	  alert(error);
  }
  return check;     
}