use a formula
like =if(cell<"",if(cell0,1,0),0) - red
and =if(cell<"",if(cell<=0,1,0),0) -green

Steve

On Wed, 24 Jan 2007 22:55:01 -0000, Hojo
wrote:

I have a form that we are setting up to calculate the number of days
someone
may have missed their due date on a project. We have if cell value is
greater than 0 it turns the cell red if we have if the cell value is less
than or = to 0 it turns green. But since not all of the projects have
been
entered if the cell is blank it still turns green. Any ideas to write a
condition that recognizes a null value. I already tried if cell value is
"null" - it didn't work.

Thanks,