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For banners I use the standard XOOPS Banners, but you can also try
this hack, which gives you more freedom, but since it's a hack, you might talk to your brother about it.
You can ignore the notices about "depreciated functions" - they are only for info.
It seems like you might have a problem with the /theme_blockcenter_l.html. If I'm not mistaken, it normally should lead to the theme path, e.g. /default/theme_blockcenter_l.html, but it seems like this is missing here, but I don't know where to look for the error. Maybe some of our Theme design experts?