Driving an 12v LED array IRF510 MOSFET.

I have 6 IR LEDs that I want to run off a cigarette light in a car. (High output infrared LED 5mm 1.2VDC 100mA 940nm)

Currently I have all six in series with a 100ohm 1w 5% resistor.

I want to have them blink using a IFR510 MOSFET could someone provide me with a schematic?