Page of Page in SMARTFORMS(Document wise)

Dear all,

I want to display Page of Page in SMARTFORMS on each document.

Example: If i am having 8 no of Purchase order(of total number of Pages 24) and each Purchase order contain different no of pages.What i want if suppose first Purchase Order contains 5 Pages then it should display 1 of 5 PAGES on first PO if second PO contains 3 pages then it should display 1 of 3, 2 of 3, 3 of 3 PAGES on second PO likewise.

I am giving range of PO in select-options.

Please suggest me the way or any Functional Module for this.

Thanks,

RP