I would like to set my desktop background to a webcam picture that updates several times an hour, for instance to this view of Tegernsee. I am looking for a way to automatically get that picture every couple of minutes from the internet and update the desktop background. How can I do that?

I would like to set my desktop background to a webcam picture that updates several times an hour, for instance to this view of Tegernsee. I am looking for a way to automatically get that picture every couple of minutes from the internet and update the desktop background. How can I do that (I would prefer a bash or applescript solution)?