There will be no problem that if, after we CSS the site, the only *style* information that is sent is one that is specified in the theme the user has selected (assuming, of course, that there's a "no style" theme), or in the stylesheet that the user specifies. Just because the CSS classes or ids are there, does not imply that CSS will be applied correctly.

(Now, extending this further, it would be interesting to allow two different stylesheets that a user can specified, one for NS4, and one for everything else, but I don't think we need to go that far.)

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
"I can see my house from here!"
It's not what you know, but knowing how to find it if you don't know that's important