function Form4Validate(theForm) {

  if (theForm.FullName.value == "") {
    my_alert('Error', "Please enter your name");
    theForm.FullName.focus();
    return (false);
  }

  if (theForm.FullName.value.length < 4) {
    my_alert('Error', "Please enter your name");
    theForm.FullName.focus();
    return (false);
  }

  if (theForm.FullName.value.indexOf(' ') < 1) {
    my_alert('Error', "Please enter your name");
    theForm.FullName.focus();
    return (false);
  }
 
  if (theForm.FullName.value.length > 50) {
    my_alert('Error', "Please enter your name");
    theForm.FullName.focus();
    return (false);
  }

  if (!is_valid_email(theForm.EmailAddress.value)) {
    my_alert('Error', "Please enter your email address");
    theForm.EmailAddress.focus();
    return (false);
  }

  if (theForm.EmailAddress.value.length > 50) {
    my_alert('Error', "Please enter your email address");
    theForm.EmailAddress.focus();
    return (false);
  }

  if (theForm.CompanyName.value == "") {
    my_alert('Error', "Please enter your company name");
    theForm.PhoneNumber.focus();
    return (false);
  }
  return (true);
}