Probably dumb question, but how do you use multiple .iso disk images when installing a guest OS (in this case Oracle Enterprise Linux 5)? It comes as a set of five .iso disk images. The first one (the one I selected via the "Choose ISO image" dialog) was processed with no problems, then it prompted me for disk 2. I don't see an "Eject" button for a virtual disk image. How do you point it at disk 2?