I'll check into what the spellchecker can provide in terms of customizing it. I'm developing for a customer and so it has to work on IE, FF and FF for Linux. We have tried the MS Word one initially and it worked ok, but it would not pick some mispelled words and was not intuitive to use. For instance, the menu options and data dictionary were not visible. ActiveX does not work in Firefox either, so we had to scrap it.