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Brett_Tabke - 7:57 am on Sep 4, 2000 (gmt 0)
What I do in your situation is use absolute addresses to the main site on EVERYTHING from hrefs to images. Don't give the spider a chance to think there is something there that isn't. Even if the spider stumbles in the side door on a page on your secondary domain names, they should see all links pointing to the main domain. Most of the se's won't index the page unless it has atleast one internal link pointing at it.
All the important ones do Pete.