Okay guys - lots of CSS breaking going on in IE7 alone - I'll Check lower end IE's once we fix these issues:

All tables break apart terribly. I checked out your css and html coding and feel that you are trying to accomplish this way harder than needed. Instead of having 3 cells for headerLeft, headerMiddle and Header Right (I am talking where forum index resides) - just have a single cell with the background that repeats. Then have forumLeft and forumRight be a div that is floated to the right - and to the left. This will fix your top corner issues.

About the bottom mis alignments - I would loose the bottom corners - more work than is needed. I see that you are trying to accomplish a liquid site but this is breaking it more - so the less moving pieces the better.

I used this style of development on this site: http://scaua.org/

As you'll see percentages are good, but no where near perfect. Anyways - let me know when you have these things fixed and I will look at them closer as well as verification issues.

Take Care Guys,

Greg

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http://www.gkwinspired.com
http://www.gkwdigitalmedia.com