You can use Aspell as an orthographic corrector directly in jPreTeX.
In order to do this you start the corrector by
clicking on the corrector jPreTeX
button.
jPreTeX has by default the French and the English dictionnaries, you can install any other you like in the directory
../jaPreTeX/Aspell/dict/
these dictionnaries are free programs working on Windows, MacIntosh and Unix.
A change of language is automatically noticed by Aspell and the language is the one you choose by the menu commands
Preferences->jPreTeX Preferences
then you choose "Langue du Texte" in the combo box.
If there is a misspelling, the corrector button
changes and you have a list of proposed corrections in red in the status bar at
the bottom of the screen.