function prevalidate(form)
{
  if ((form.name.value == '') || (form.surname.value == '') || (form.email.value == '') || (form.email2.value == '') || (form.phone.value == '') || (form.address.value == '') || (form.postcode.value == '') || (form.auth.value == ''))
  {
    alert('You must fill in all fields');
    return false;
  }
  else
  {
    if ((form.email.value != form.email2.value) || (form.email.value.indexOf('@') == -1) || (form.email.value.indexOf('.') == -1))
    {
      alert('Your email address appears to have an error in it - please check it');
      return false;
    }
    else
    {
      if ((form.tandcs.checked))
      {
        return true;
      }
      else
      {
        alert('If you do not agree to the terms and conditions you cannot register to use the booking system');
        return false;
      }
    }
  }
}