How to display different logos on selected forums?

[fabaa]

Thank you!!

In header template, do I replace MY SITE with an image url? Can I center the image?

Also in global css, this line:
background:url(images/logo.png)no-repeat;

Do I replace exactly "url(images/logo.png)" to an URL, with a space between 'no-repeat;'?

Thank you again!
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Oh never mind I think I know how to edit global css now. Thanks!