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Although I'm not sure why it needs to be CSS instead of plain HTML. It's not like the HTML adds much code size overhead, and surely it prevents the browser from having to look up all of the cell values each time. bgcolor=F8F8F8 vs class="even" isn't much different, and these pages are completely dynamic so it's not like having an abstracted reference makes it any easier to maintain. If it can be done without CSS I'd prefer it that way.