function ValidateForm(field)
{
  var result = false;

  var emailField = document.emailform.email;

  var trimRegexp = /(\s+|\")/g;
  emailField.value = emailField.value.replace(trimRegexp, "");

  var email = emailField.value;

  if ((email == null) || (email.value == ""))
  {
    alert("Please enter an email address.");
    emailField.focus();
  }
  else
  {
    if (email.search("^[A-Za-z0-9_.-]+@[A-Za-z0-9_.-]+\\.[A-Za-z]{2,4}$") > -1)
    {
      result = true;
    }
    else
    {
      alert("Please enter your full email address.");
      emailField.focus();
    }
  }

  return result;
}