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Hope the above works out for your problem, let us know here. There may be others on the board that could suggest alternatives also.
You can use regex in the redirect directive if you wish.
You could use relative links for your images etc. instead of direct links.
RedirectMatch /virtualdirectory/(.*)\.html$ http://virtualdirectory.com
eg. virtualdirectory/images/image.png instead of http://virtualdirectory.com/images/image.png
The advantage of using .htaccess is the proper url will be showing in the visitors browser and if they choose to bookmark then they will have the correct address not a bot botch up.
These are a few of the ways to have things happen the way you want them. Being in control is a nice warm fuzzy feeling