Display plus sign

From: Charlie (anonymous_at_discussions.microsoft.com)
Date: 09/20/04 

Date: Mon, 20 Sep 2004 13:44:54 -0700

Is there any way to format a row of cells so that a plus
sign displays in front of all positive numbers. My
spread*** calculates the percentage of change in a value
from a prior year and I just think it would be clearer to
a casual observer to see the "+" and "-" signs in front of
each number. It is easy, of course, to have the minus
signs displayed, but I'm at a loss to figure out how to do
the same thing with plus signs.