Using image as a button in form_submit

[eluser]Unknown[/eluser]
Hi, I know this post is 2 years old but I thought I'd add what I did (maybe someone can correct it if I'm not doing this right as I'm new to CI)...

Basically I put the image as a background in the CSS and did the following in the loginform.php

Code:

<?php
$property_type = array('class' => 'form-submit', 'src="'.base_url().'"/application/_images/login-btn.png"', 'name' => 'Login'); echo form_submit($property_type); ?>

?>

Did I just fluke out getting this to work? I don't know but it does exactly what I need it to do.