How to conditionally suppress a field based on whether a page number is odd or even?

Select the field
Click FORMAT
Click FORMAT FIELD
Select the COMMON tab
Click the FORMULA BUTTON to the right of SUPPRESS
(Don't click the suppress check box)
To suppress a field on odd numebred pages
PageNumber MOD 2 = 1

To suppress a field on even numebred pages
PageNumber MOD 2 = 0

Click SAVE Icon
Close the formula editor
Click OK on the FORMAT screen