Using a CS4 Script in CS5

I have a CS4 InDesign script written in Javascript. I'm trying to get it to work in CS5 but having problems.

I have read online that adding the line...

app.scr开发者_开发技巧iptPreferences.version = 6.0;

Will cause the Script to be read as it would be in CS4, however I have added the line of code and it seems to have no effect.

Except causing the following to be written at the end of errors...

"Interpreter: CS4 (6.0)"