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What you are looking to do requires some advanced scripting (spellchecker), the rich-text editor is can be done using javascript or an IE scriplet.
A tutorial for creating a Hotmail/Yahoo type rich text editor can be found here [codeproject.com] Though you still need to add spell-checker functionality.
Thanks. That was exactly what I was looking for. I'm probably going to have to pay for a spell checker program because I'm not that good at programming.