question about optional arguments

[leo]

hi there

the function dired-get-marked-files  has two optinal arguments, so its
definition looks like

    dired-get-marked-files (&optional localp arg)

now i want to call dired-get-marked-files with the specific value 1 for
secend argument arg but without a value for the first argument localp,
because the function behaves differently, whether call with an optinal
localp or not.

calling it with true for localp like

    (dired-get-marked-files t 1)

obiviously doesn't do the job. so,what can i do?
thanks a lot, leo