おさしぶりとひさしぶり

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Aug 14th 2010 23:15
what is the difference between ?
ひさしぶり
and
おさしぶり

おさしぶり is more polite ? or i made some mistake and there is just ひさしぶり ?
Because in some words when you add お is more polite right ?

てつだってください
ありがとう