How to Change the Header Logo in WHMCS

I wanted to change the logo at the top of my WHMCS client facing pages. The image doesn't seem to be hosted locally... I hacked the template like this:

vim templates/default/header.tpl

change the following line:

<img src="/templates/{$template}/header.jpg" width="730" height="118" alt="" />


<div align="center"><img src="" alt="" /></div>