Password setting option in digital lock code using 8051?

[shobit2]

I am building a Digital lock using AT89s52, I have seen some projects on web, I  have used this one to build Digital lock: Digital code lock using 8051, 
Its working fine but in this project, password is predefined in code, but I want to set the password on run-time. Then I further searched and used this code in my project. But as soon as i used this code, it gives me error in the code. Later project is built on AT89c51, Is this problem? Can any body help.