function checkform ( form )
{

  if (form.Name.value == "")
  {
    alert("Please enter your name.");
    form.Name.focus();
    return (false);
  }

  if (form.Name.value.length < 2)
  {
    alert("Please enter your complete name.");
    form.Name.focus();
    return (false);
  }

  if (form.Email.value == "")
  {
    alert("Please enter your e-mail address.");
    form.Email.focus();
    return (false);
  }

   if (form.Email.value.indexOf("@") == -1 ||
   form.Email.value == ""){
   alert("Your e-mail address must include an @ sign and dot.");
   form.Email.focus();
   return false;
  }

  if (form.Email.value.indexOf(".") == -1 ||
  form.Email.value == ""){
  alert("Your e-mail address must include an @ sign and dot.");
  form.Email.focus();
  return false;
  }

  if (form.Email.value.length < 4)
  {
    alert("Please enter a valid e-mail address.");
    form.Email.focus();
    return (false);
  }

  if (form.Bold.value == "")
  {
    alert("Please enter your advert title text (up to 6 words).");
    form.Bold.focus();
    return (false);
  }

  if (form.Text.value == "")
  {
    alert("Please enter your main advert text (up to 40 words including title).");
    form.Text.focus();
    return (false);
  }

  if (form.Pages.value == "")
  {
    alert("Please enter the page(s) you would like your advert to appear on.");
    form.Pages.focus();
    return (false);
  }
  return (true);
}