
pladv: Advance the (sub-)page

DESCRIPTION:

    This function is used in examples 1,2,4,6-12,14-18,20,21,23-27,29,31. 

SYNOPSIS:

pladv(sub)

ARGUMENTS:

    sub (PLINT, input) :    Specifies the subpage number (starting from 1
    in the top left corner and increasing along the rows) to which to
    advance.  Set to zero to advance to the next subpage. 
