Alarm System Shock Sensors

[evilspoons]

Hi everyone, I have a 2004 S60 with the 'standard' factory security system. It has the red light that blinks on the dash, and it honks the horn if you press the panic button.

I do not have the shock sensor package (the button on the dash is missing, etc).

In the light of someone trying to break in to my dad's Mazda 3 last night, I was wondering if it's possible to upgrade the S60 to include the shock sensors, and if so, what kind of cost I am looking at. (I.e. not astronomical - this seems unlikely.) I imagine someone other than myself would have to do it, probably the dealer to reprogram the car's computer system.

Thanks in advance!