NO! don't put chains on your 17s.
there are a couple of reasons.
1. because the tyres are lower profile the chains will actually come down and run on the rim, damaging if not destroying them.
2. the reduced clearance between wheel and body/suspention may mean that the chains will contact the body/suspention doing untold damage.
my best suggestion would be to get a couple of old 15s, put some ok tyres on them and then keep them in the garage with the chains fitted to them. then all you need to do is chuck them in the boot when you go to the snow, and bolt them on when required.