I've got a 1999 Vauxhall Corsa, and it doesn't have central locking or an alarm. I bought a central locking and alarm kit off tinternet, and it came with two fobs and flip-out keys. I got the keys cut today and can open the car with them, but I can't start the engine because I've just found out that it has an immobiliser, and the transponders are built-in the original keys. The body of these keys is solid plastic, but if I could drill into them, could I take out the transponder and put it in these new fobs? Are the transpoonders battery powered? If I can't do this, do you have any other ideas of ways I can get round this? :/