I am using Kubuntu 12.10 and have 10 min. screen timeout for reducing the brightness. I just migrated from Windows and now I have a problem with "idle mode". I've also read this and this.

But for example, when I am also talking via skype or any video conference software, I have the same problem. I do not want to move my mouse every time since this is annoying.

How can I write a script to prevent screen sleeping or dimming if there is a sound, for example?