Sound notification when idle

How about a sound notification when I get a new message. But only when I when I´m away from the computer.

I like your thought. But what if you are away from the computer, but not yet idle (I believe the default time it takes before Digsby goes idle is 5 minutes).

It is a possibility to make it an option, and then change idle time to 1 minute, or even shorter then one minute.