I've come a little farther in my experimentation.
Today's flash show offline DHTML. The flash doesn't do the FX justice btw. When I'm done tinkering, you'll get to see the real deal.
I put the mootools framework JS inside a RichText-item on a document. Fetch the js as a string. Write the string and some HTML to the WebBrowser-control. Hey Presto! Offline DHTML.
My brain is fried right now, so no more programming today.. :)