Page footer suppress conditionally

Hi,

     We are using crystal reports XI  version .I have a problem to suppress the page footer on conditionally.

     we have 3 page footer sections these should be display on last page of the each invoice, Are using formula field to suppress these footer sections. It is working fine but empty space is displaying.

     Note:We have text fields and drawing objects in these footer sections to display database text fields and using drawing objects to display lines.

Formula Field:    

if pagenumber = TotalPagecount then

false

else

true

In the above code pagenumber is a formula field we are using to count page numbers it will be reset when invoice changed to next one.

Regards,

Chakradhar.