Your banner isn't showing up on any page other than your front page.

It works fine on
http://radio.weblogs.com/0001011/
But on
http://radio.weblogs.com/0001011/2004/08/21.html
it starts looking for
http://radio.weblogs.com/0001011/2004/08/heading.jpg
and doesn't find it.

It even says so in your HTML
"<!-- FIX ME: you will need to fix the url for this to wherever it belongs -->
<img src="heading.jpg" alt="Scobleizer: Microsoft Geek Blogger" width="730" height="114">"