function formcheck()
{
  var frm = document.forms["frm"];

  if (frm.Surname.value == "")
  {
    alert("A surname is required for an online booking.");
    return false;
  }
  else if (frm.Email.value == "")
  {
    alert("An email address is required for an online booking.");
    return false;
  }
  else if (frm.Telephone.value == "")
  {
    alert("A contact number is required for an online booking.");
    return false;
  }
  else if (frm.Date_Choice.value == "")
  {
    alert("A date of dining is required for an online booking.");
    return false;
  }
  else if (frm.Time_Choice.value == "")
  {
    alert("A time of dining is required for an online booking.");
    return false;
  }
  else if (frm.Number_of_Adults.value == "")
  {
    frm.Number_of_Adults.value = "0";

    if (frm.Number_of_Children.value == "")
    {
      frm.Number_of_Children.value = "0";
      if (frm.Number_of_Adults.value == "0")
      {
        alert("At least one person must be entered dining is required for an online booking.");
        return false;
      }
      return false;
    }
  }
  else if (frm.Number_of_Children.value == "0" && frm.Number_of_Adults.value == "0")
  {
    alert("At least one person must be entered dining is required for an online booking.");
    return false;    
  }
  else
  {
    return true;
  }
}