switch camera in Mac?

I added a second camera to my scene. But now how do I switch the camera view from my first camera to my new second camera? On the web, I found the advice to use ctrl + numpad 0. But I have a Mac, how do I do this on a Mac?

I usually go to the scene and select the camera, then use control+option+numpad 0

in Blender 2.5, View->Cameras->Set Active Object as Camera