Form helper - Layout?

[eluser]austintbiggs[/eluser]
When creating a form using the form helper I'm only able to get the inputs stacked vertically; what I'm aiming for is to place them side by side horizontally.

Here's the code I've got:

Code:

<?php
    echo form_open('membership/validate_credentials');
    echo form_input('username', 'Username');
    echo form_password('password', 'Password');
    echo form_submit('submit', 'Login');
    echo form_close();
   ?>

Any and All help is appreciated [: