EDIT: vchris, I got it. I had to put the "margin: 0 auto;" in another part also. Thanks a lot for the idea.I still can't get my site centered in firefox. Here is my body section with your suggestion:body { color: black; font: 70% Verdana,Tahoma,Arial,sans-serif; text-align: center; background-image: url('images/background2.gif'); background-position: center; margin: 0 auto; } I really only increased the font there to be a space filler. If its that bad, I will try to find something else to fill the space. The whole tab panel needs to be the size it is because the chart in the middle tab. I am not really using frames. When my domain company redirects URL www.slimcalcs.com to the server IP, it puts in within a frame.Thanks for the suggestions.