Led 12v

How to make this simple L.E.D. circuit?

I want to create an LMFAO robot costume but I don't remember enough of physics II to do the circuit for the eyes. I need to have four red L.E.D.'s in series powered by a 12V battery but I don't know what kind of resistor I need so that they last longer. This is because I want to be able to switch them off and on, not simply hold a button. Here are the specs.

LED specs:
1.7V to a maximum of 2.4V
20mA current (max).

Don't be afraid of getting to technical, I still remember some of what I learned in that class.

one 200 ohm resistor 1/2w.

Connection:
+12V -- small switch --- 200 ohm --- anode of first LED --- Cathode of first LED --- Anode of second LED -- -- -- -- and so on ---- Cathode of 4th. LED --- 12V negative.

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