Problem with "Blinkers" for bike trailer?

thanks jimmy,
But I am not allowed to go to jaycar because its so far away and it takes to long from ebay aswel. I have thought about using a SPDT switch with a center off position. Also pull-up resistors are just normal resistors that pull the line up aren't they? Also wouldn't you need pull-down resistors because the code detects the switch and blinks when it is High?
thanks heaps,
Jabelone