Rokbox is our popup modal extension. But that has to be triggered by a click on something. If you want an "automatic" modal popup when you visit your site then have a look on JED for a suitable extension - there are plenty on there.
Regards, Mark.
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There's loads on JED so it really does depend on what you want - they're known as splash panels. Here' just one I found
http://extensions.joomla.org/extension/jh-splash-screen
- but I haven't tried it - the demo seem what you were asking for.
Regards, Mark.
Please search forums before posting. Please make sure your post includes the version of the CMS you are using and a link to the problem. Annotations on screenshots can also be helpful to explain problems/goals. Please use the "secure" tab for confidential information.