// JavaScript Document
function Seminar_Form_Validator(SeminarForm)
{

  if (SeminarForm.Vorname.value == "")
  {
    alert("Error: Please enter these details: your first name");
    SeminarForm.Vorname.focus();
    return (false);
  }

  if (SeminarForm.Nachname.value == "")
  {
    alert("Error: Please enter these details: your last name");
    SeminarForm.Nachname.focus();
    return (false);
  }
  
    if (SeminarForm.EMail.value == "")
  {
    alert("Error: Please enter these details: your email address");
    SeminarForm.EMail.focus();
    return (false);
  }
  
    if (SeminarForm.Personenzahl.value == "")
  {
    alert("Error: Please enter these details: number of attendees");
    SeminarForm.Personenzahl.focus();
    return (false);
  }

  if (SeminarForm.Telefon.value == "")
  {
    alert("Error: Please enter these details: telphone number");
    SeminarForm.Telefon.focus();
    return (false);
  }

  return (true);
}