java script for doesn't word (its's made for index)

Hy,

I have a java-script, for indexes (for InDesign is CS3) - but it doesn't work.

I attached 2 files, the first one is the script, the second one is the error-message from InDesign CS3.

(My friend is working with CS4, the script there is ok.)

We renewed java-system, because for script, but we haven't better result... 😞

Please, help me, thanks,

Anna