o.k. Depending of your transmitter you may need some decoder like holtek HT640,HT648L. You can also do it in software... for sure. For your purpose you will use SERIN,HSERIN command. Be sure of your transmitter baud rate too.

This may help you.
http://www.rentron.com/rf_remote_control.htm

ok it's in basic stamp language but... close to picbasic!!!

here's a few remote control project
http://www.rentron.com/remote.htm

say thanks to Bruce!!!

hope this help