Image host layout assistance

I have a website called picmecca.com. It’s a simple image host coded in php and I need to: ? Allow the AD areas at the right/left/bottom/top positons to auto accommodate (keeping simmetricallity as well) when a banner or AD of any size/type is added, because the page layout loses it’s arrangement when larger ads are used.? Right now the site’s using? 160x600 ads at the sides, and 728x90 ads on top/bottom. For example, If a 500x500 or 1000x1000…. tag cloud has to be included on either side or bottom/top, it has to accommodate well without messing the page layout or overlapping. ? WARNING: there are adult image categories listed on the site, so that you know you may see adult pics at some moments.