Suppressing function already exist warnings ?

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Hi,
I've defined couples of functions inside ~/.vimrc , everytime i modify
it , and command source ~/.vimrc will complains about duplicate functions.

How could i suppress such kind of warnings , and i need to replace
functions that already exists.

Many Thanks !

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Best Regards,
Aaron Lewis - PGP: 0x4A6D32A0
FingerPrint EA63 26B2 6C52 72EA A4A5 EB6B BDFE 35B0 4A6D 32A0
irc: A4R0NL3WI5 on freenode
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