I have an older Ixus 80 and a newer Ixus 90 IS. I want to use on of them as secutity video camera. It should start recording when there is motion, and stops after a few minutes when there is no motion anymore and go into detection again. Or, if this is not possible, start recording when there is motion, record for a period of time, and then go into detection mode again. As I read that the 90 IS isn't ported yet, I supose I'll have to use the 80 instead. So I have to install CHDK (ok) but then? Which script do I have to download and install? Where can I find it?