Template for all pages except homepage

[wheel]

I want to insert a banner graphic near the top of the page for all pages except the homepage of the forum. Any thoughts on what template I need to modify to accomplish this?

Alternatively, since I'm using a plugin to display the banner, would I perhaps accomplish this through the php code (i.e. check if it's the homepage, and if so, don't display, otherwise display)? This seems like a more complex way to do it though.