Connecting Sennheiser RS 170 to LG TV LW6500

[rahuln]

I am planning to buy Sennheiser RS 170 to listen to TV (LW6500) in living room. I already have speakers (Onkyo LS3100) connected on optical out.

Now if I connect anything on headphone jack there is no audio from speakers. I don't want to use both at the same time but it is quite tedious to connect the headphone wire everytime I want to use the headphone.

How can I switch between the two without reconnecting wires.

Thanks