Printing command string passed to EXECUTE command in plpgsql (after argument resolution)

I am debugging a plpgsql function which contains a long sql query
consisting of several parameters which is executed using EXECUTE
command. I would like to output this command string including the
actual values of the parameters contained within it so I can obtain
the actual query and run it directly (manually) in psql (or other
client such as pgAdmin3). Or at least is possible to output the
command string as is, followed by the parameter resolution details
such as $1='2', $2='abc' and so on.

Allan.