Drag the file from Windows Explorer to the Links bar in IE to create a shortcut to the script.
That didn't work for me. Instead, I created a shortcut to the .
js file in the same directory as the file and dragged the shortcut to the IE Links bar.
Works fine now - except that any text in the clipboard from other activities gets pasted onto the end of my replies after the spellcheck is complete. I can live with that, and if you empty the clipboard with the clipboard viewer that problem is fixed.
(Edited to tidy it up a little)
AA