hawk540:I use Firefox (not sure which version). If it does have an inbuilt spell checker I have no idea on how to get to it
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What the spellchecker does is underline words you have misspelled. It should already be set.
But if it is not, you can go to Tools-->Options-->Advanced-->General.
It should be on General since it is the first tab that I have. Under General, locate Browsing, and make sure the "Check My Spelling as I Type" option is checked.
This is all on Firefox 3, but it should be relatively the same.