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Kobayashi - 7:06 pm on Mar 22, 2008 (gmt 0)
This is accomplished in one of two ways. The simplest is to put the landing page URL as your destination URL when creating your ad. The other is to put a URL that automatically redirects to ones landing page as the destination URL. In either case so long as the page that the user ends up on has a top level domain that matches the one in the ad all is good. [edited by: Kobayashi at 7:09 pm (utc) on Mar. 22, 2008]
To those asking what is ok, think of it this way. You got the display domain that shows up in the ad and the domain of the landing page one eventually ends up on after clicking the ad. So long as the top level domain in the ad matches the top level domain in the landing page you are ok.