[MrEyes]

The easiest way to do that would be via a THIS_SCRIPT conditional check in the header template. Something like this:

<if condition="THIS_SCRIPT = downloads">
  <img src="downloadsLogo.jpg" alt="logo" />
<else/>
  <img src="normalLogo.jpg" alt="logo" />
</if>

That code isn't checked and was just written from memory, so it might not work - but it will point you in the right direction