I just changed my entire site over to php pages so I can run these ads (there are other reasons also ). I put the ads up and they appear correctly, so that part works, but the site won't validate. Is this because Google has all the old .htm pages and the ads are on the new .php pages? In other words does the validation script look at pages shown in the site:www.yourdomain.com listing to see if the adds are showing and if they are not it fails? If this is the way it works does that mean I won't be able to validate until Google drops the old pages and shows the new pages? Thanks...
Yeah, unfortunately that would be the case since it's grabbing random pages that Google knows about in order to spot check the site for validation.