I have never been able to get this to work. If anyone has been successful, please tell how. This is exactly what I wanted and would be a very helpful script. Kudos to the author in any case for the efforts.

Thanks for this great script. It works fine for me when Gmail/Google Apps is set to English (US) or English (UK). But it does not seem to work with a few other Gmail display languages that I've tried, such as Spanish or Indonesian.

Does the script rely on parameters that are inherently English-only?