Spaced Out

[Richmond]

Running a detection script like this:

on mouseUp
    set the useUnicode to true
    put the word 4 of the selectedChunk into W4
    put (W4 - 1) into W5
       get charToNum(char W5 to W4 of fld "MyGuff")
       put it into UNIK
    put the word 2 of the selectedChunk into W2
    put (W2 - 1) into W!
       get charToNumber(char W2 to W1 of fld "MyGuff")
       put it into UNIQ
    put uniEncode("The insertion point is between '") into P1
    put uniEncode("' and '") into P2
    put uniEncode("'") into P3
    set the unicodeText of fld "WhereAreWe" to P1 & numToChar(UNIK) & P2 
& numToChar(UNIQ) & P3
end mouseUp


detects a SPACE when the insertion point is BEFORE the space, but

does NOT detect a SPACE when the insertion point is AFTER a space.

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Where am I going wrong?