Relative URLs get changed

The problem occurs when I copy and paste out of the design mode into another page. When it gets pasted into the other page, it adds the domain to the relative urls.

Example:
<a href="/default.aspx"> gets changed to <a href="http://iistest/default.aspx"> when copied out of the design view into another design view page. Is there a way to stop it from rewriting the URL when pasting from another page in design mode? My users dont like to copy the source code..... It does happen on the demo page on the ck editor site as well.

Thanks.