Bluetooth Proximity Advertising/Marketing software

I am looking for a program that I can load into a laptop that will allow me to broadcast sms text, photo, avi files etc to any cell phone in the immediate area of say a shopping mall. The program exists but I am not all that excited about the range of the broadcast. I am looking for an enhancement to it or a better form that may already be available. The use is for retail outlets to broadcast a special to any bluetooth activated cell phone that is in the immediate area. The existing program is loaded into a laptop or even a PC and via a dongle transmits the message via sms or mms to the cell phones that are nearby. I would be gratreful for any information or a quot to write a program for me.