Check that the brake lights work. The neutral park solenoid needs to see an input from the brake light switch before it allows the transmission to be taken out of park. If the brake lights don't work check the switch and fuses. If not the solenoid that allows the shift linkage out of park may have failed. Nearly every car has a mechanical override to allow the transmission to be shifted out of Park. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info .There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You get a one year subscription to year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual. http://bit.ly/alldata_repair_manuals or try http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription.
Recently we had this exact same problem. The cheapest way out was to have the mechanism that prevents you from shifting out of park removed. If you choose this option be sure to set the emergency brake when you park to avoid accidentally shifting the car out of park, since the gearshift will then be very sensitive to touch.