How do I convert a column to negative numbers?

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From: VanillaMc (VanillaMc_at_discussions.microsoft.com)
Date: 08/28/04 

Date: Sat, 28 Aug 2004 10:23:01 -0700

I am looking for a quick way to covert a column of posative dollar amounts
into negative dollar amounts. Is there an easy way, other than retyping the
whole thing?

Thank you.