What you will need:
EL Wire and Inverter - I recommend http://ez-el.com/ez-el-wire/10ft-ez-el-wire-3v-inverter-kit/
Arduino or any micro controller that can control a relay
SPDT Micromini Relay 5V - I recommend Radio Shack 275-0240
Heat Shrink Tubing or Electrical Tape
General Purpose PC Board
Soldering Iron and Solder
Wire Cutters and Strippers
Step 1: Schematic
Step 2: Wire Up the EL Wire
Next solder the ground wires together.
Now connect the voltage wires to the relay as shown in the schematic.
You might want to solder the wires and the relay together on a small PCB.
Step 3: Connect the Relay to the Microcontroller
Before you use this be sure to power on the EL Wire inverter. Make sure is is in a non blinking mode.
Any code that works with an LED will work with this hack.