HTML layout question

Dear Sir or Madam, I'm writing an article for A List Apart Magazine (http://www.alistapart.com) about CSS layout and I would like to ask you a question: Why do you use tables for the layout of the PHP site instead of CSS? Is this because your authors don't know CSS, because CSS is unsupported in browsers, because CSS is not powerful enough to lay out your designs or is there another reason? Any response you can give to this question will be greatly appreciated! I'm trying to sum up the situation with CSS at the moment, and look at where it might go in the future. Thanks for your help, Ben Godfrey (q) Ben Godfrey? (a) Web Developer and Designer See http://aftnn.org/ for details