Ah ok, I see the problem, or at least I think I do
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ASP.NET by nature has some security settings enabled by default that prevent XSS attacks on your webserver. You can however turn this off, so you can insert html elements in your textbox, by setting the ValidateRequest property of the page to false. I encourage you to do this only on pages where you need admin privileges so that not everyone can start typing in stuff to bring down your site.
Grz, Kris.
Read my blog | Members are volunteers so please keep out the (it's urgent | asap | reply me directly) stuff. Nobody's interested in that.