Create directory

[Alt-Ox]

I'm working with a login script.
how can I create a directory on unix systems by using action script?

I mean, with PHP we can do that with the code:

$ufolder = $_SERVER['DOCUMENT_ROOT'].'/user/'.$user…
if (!mkdir($ufolder, 0777))
die 'Unable to create the directory"'.$username.'"<br>';

is it possible to do that with actionscript?

tks