ok, when you create a link:
Code
[url=http://www.gizmo-is-the-bestest.us/]Gizmo Rules[/url]

It is automatically created (by the BBCode parser) with the norel attribute.

If you allow HTML, and users insert the link:
Code
<a href="http://www.gizmo-is-the-bestest.us/">Gizmo Rules</a>
the norel attribute will not be attached as it puts the content in as specified.

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