I want to know how to replace a broken fob?

I had a laserline 270uk alarm and immobiliser added to my import mazda. All the system works well, but my fob is broken and I need a new one. I can use the key manually and it disengages the alarm/immobiliser, so that's not a problem, but I'd like to get a new remote control, so I don't have to open manually, but not sure if I can get any kind and have someone program it, or if I need a particular type. At present, my car key fits into the old fob.