Code for Ford 5000 RDS stereo Changed Battery?

Hi There,
Could someone please help me?
I recently had to change the battery on my Focus and now the car stereo is just saying CODE. I've looked in my handbook and the code is not there!
Could someone please tell me what my stereo code is please?

The stereo is a Ford 5000 RDS. Serial Number: M395236

Thanks for your time to anybody who can help.
Cheers Guys,
Dan.

Dan
March 2008