How to change or "mask" message/send in URL to just message?

[eluser]term25[/eluser]
I would like to change or mask the function name in my url, so when the send button on the contact page (http://localhost/message) is clicked, it goes to the function send in my message controller.

And here is the problem. When the user make a mistake a form_validation catch the error and send it back to the view like ->

Code:

if ($this->form_validation->run() == FALSE)
{
    // VALIDATION ERROR
    $this->load->view('message_view');
}

It should be OK, however the URL in the browser looks like:
http://localhost/message/send which doesn't look "cool".

Is there a way how to mask or change the URL address to be always just http://localhost/message even after the form_validation error?

How can I do such thing via htaccess or some trick in CodeIgniter itself?

Thanks in advance.