HELP hooking up component and speakers.

I have two systems. Home Theater with my NAD 773 Receiver as the center of that system. My second system is my 2 channel Dynaco ST-70 and PAS3 preamp. I want to use my Von Schweikert VR2 front speakers for both systems. How do I hook them up where I can run the 2 channel system in the afternoon and fire up a movie at night? I cant just run speaker wire from both amps, can I? Do I just need to unhook and plug in the speaker wire for the system I am using at the time?