"money" binary representation

I'm trying to read "money" field using PQgetvalue (PostgreSQL 8.3.7). The
function returns 9 bytes, smth like 0h 0h 0h 0h 0h 0h 14h 0h 0h, for the
value '$50.2'. I could not find description anywhere on how to convert the
binary data into, for example, a double precision number.

Would you please help me find a method of converting binary "money" data
into a double precision?

Thank you!