Logo and secondary Wiki

Hi,

I would like to configurate the logo of secondary wikis so that they link to the welcome page of the main wiki, how can I do that?

Thank you.

Hi, I’ve created a new FASQ entry for you at http://www.xwiki.org/xwiki/bin/view/FAQ/Can%20subwiki%20logo%20link%20point%20to%20main%20wiki