function validateContactForm(form)
{
  if(form.full_Name != null)
  {
    if (form.full_Name.value == "")
    { alert("Please enter your name.");
      return false;
    }
  } else if (form.fullName != null) {
    if (form.fullName.value == "")
    { alert("Please enter your name.");
      return false;
    }
  }

  if(form.first_Name != null)
  {
    if (form.first_Name.value == "")
    { alert("Please enter your first name.");
      return false;
    }
  }

  if(form.last_Name!= null)
  {
    if (form.last_Name.value == "")
    { alert("Please enter your last name.");
      return false;
    }
  }

  if(form.email != null)
  {
    if (form.email.value != "")
    { if (form.email.value.indexOf("@") == -1 || form.email.value.indexOf(".") == -1 || form.email.value.indexOf(" ") != -1 || form.email.value.length < 6)
      { alert("Sorry, the email address does not appear to be valid.");
        return false;
      }
    }

    if (form.email.value == "")
    { alert("Please enter your email address.");
      return false;
    }
  }
}