Cursors in PL/pgSQL

Is there any way to declare a cursor in  PL/pgSQL.

Basically I need to write a store proc that cycles through a table row by
row and terminates at the last row.  Do I have to write it in  using
PL/pgSQL (PL/pgSQL won't let me use many of the normal sql keywords) and,
if I do, how do I cycle through a table?

Thanks

Rob

--
He who dies with the most toys ...

                    ... still dies