I bought my second amplifier today and now I have a Randall and Marshall sitting on my 1960 cabinet. I only play on one at a time but is it possible to have both plugged into the cab? it would just save the hassle of changing the plugs between the 2 constantly. thanks
Sure if you only want two speakers per amp head. Just rewire it.

There are some switching devices out there and Trashed had a thread about it a few days/week ago that had some suggestions.
Jackson Kelly KE3 - MIJ (Distortion/Jazz)
Jackson DKMGT Dinky (EMG 81/85)
ESP E-II Eclipse Custom (JB/'59)
ESP LTD EC-1001FR (EMG 81/60)
Fender MIM Strat

Mesa/Boogie Dual Rectifier Roadster 212
Laney IronHeart IRT-Studio
Peavey Vypyr 30
Peavey ReValver Amp Sims
TOOOO many T.C. Electronic Pedals. . .
Switch the 1960 to stereo. Run one amp into left and the other into right.
Gilchrist custom
Yamaha SBG500
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100

Cathbard Amplification
My band
Just make sure you don't plug in the wrong amp and power on the one that isn't plugged in...
You can do what you're thinking, but the word, "Ooops!" might signal your downfall <G>.

I hate to hear, "You were right; I shoulda listened."
Quote by Cathbard
Switch the 1960 to stereo. Run one amp into left and the other into right.

This is the correct (safe) answer. Then get an a/b/y switch for your guitar and run either amp or both simultaneously.
“Ignorance more frequently begets confidence than does knowledge.”
Charles Darwin