Expletive Deleted.

[Richmond]

on mouseUp
   put the number of chars in fld "TESTEXT" into CHARZ
   put (CHARZ - 2) into HARZ
   set the unicodeText of fld "TESTEXT" to char 1 to HARZ of fld "TESTEXT"
end mouseUp

works very well indeed (chopping off 2 because this is unicodeText) deleting
text from the end of the string.

The problem is how to get this to work just before an insertion point 
which is NOT at the end of the string.