Difference between 客气 and 礼貌 On New Practical Chinese Reader 4, workbook, page 7, there's a story about Scott and a Chinese person discussing about manners. The Chinese person says 客气 and 礼貌 are different, and that he/she feels weird when Scott says 谢谢, 对不起 and such all the time, since they're close friends.

I know Chinese don't "thank" and "please" relatives as often as Westerners, but I never could tell that 客气 and 礼貌 had any difference.

Question:  

What's the difference between 客气 and 礼貌?

EDIT:
After some thinking and analysis I think that 礼貌 is politeness related to one's personality, while 客气 is politeness related to the ways one shows it. Any thoughts?
As a complement to other answers:

客气 means 'being polite unnecessarily'. It's often used between close friends, family members, who generally don't have to be that polite to each other.

礼貌 as an adjective simply means '(being) polite'.