Xbee-Arduino Transmitter and Xbee-Arduino Receiver

Alright, I am fairly new to microcontrollers and I need to get this project done by this Friday (4/25/14). I have to get two arduino boards to communicate with each other without connection to a computer. I need to make one board (transmitter) send a signal when a button is pushed to the other board (receiver) and make a light flash and an alarm go off. Does anyone have a sample code that does something similar?