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You can get free comic strips to display on your site if you register with them and keep links back to them with the comics on your site. I found two comic strips that are free for webmasters to use. They can be added to your XOOPS site in a block or on a page you create with tiny content, cjay content or free content. I put mine in a block on my front page but they could be put on any page you want really.