Infoboxes on Wikipedia generally use CSS classes defined in

MediaWiki:Common.css or MediaWiki:Monobook.css. You can >"borrow" these from Wikipedia itself; visit http://en.wikipedia.org/wiki/MediaWiki:Common.css, and click "view source",

for instance(...)

Rob, Thanks SO MUCH. Your advice helped me to get rid of that problem. I downloaded the two php-files and edited the Localsettings for the Parser-problem, and copying the infobox-stuff into the css did the rest. Thanks again for your quick reply, I really appreciate this, and I hope I wasn´t being too much of a nuisance with such a "noob"-question =) Have a great day! Dan