function chkFormular02 ()  {
   if(document.formular_anfrage.Nachname.value == "")
    {
	 alert("Please insert your surname!");
     document.formular_anfrage.Nachname.focus();
     return false;
    }
  if (document.formular_anfrage.email.value.indexOf("@") == -1) {
    alert("No e-Mail address!");
    document.formular_anfrage.email.focus();
    return false;
  }
  if (document.formular_anfrage.email.value.indexOf(".") == -1) {
    alert("No e-Mail address!");
    document.formular_anfrage.email.focus();
    return false;
  }
   if(document.formular_anfrage.Telefon.value == "")
    {
     alert("Please insert your telephone number!");
     document.formular_anfrage.Telefon.focus();
     return false;
    }
  if (document.formular_anfrage.anreisedatum.value == "TT.MM.JJJJ") {
    alert("Please state an arrival date!");
    document.formular_anfrage.anreisedatum.focus();
    return false;
  }
  if (document.formular_anfrage.abreisedatum.value == "TT.MM.JJJJ") {
    alert("Please state a departure date!");
    document.formular_anfrage.abreisedatum.focus();
    return false;
  }
  
    if (document.formular_anfrage.kinder.value == 1) 
	{
    if (document.formular_anfrage.alter.value == "") {
    alert("Please state the age of the child!");
    document.formular_anfrage.alter.focus();
    return false; 
	}
  }
  if (document.formular_anfrage.kinder.value == 2) 
	{
    if (document.formular_anfrage.alter2.value == "") {
    alert("Please state the age of the children!");
    document.formular_anfrage.alter2.focus();
    return false; 
	}
  }
   if (document.formular_anfrage.kinder.value == 3) 
	{
    if (document.formular_anfrage.alter3.value == "") {
    alert("Please state the age of the children!");
    document.formular_anfrage.alter3.focus();
    return false; 
	}
  }
 }