[jQuery] Validate / Remote

[RCLumbriga]

Hi..  Sory the really bad english

I have one problem with remote in Jquery.validate

I do this

 cusuario:{
                                required: true, minlength: 5,
                                remote: "verifica_user.php"
                            },

Now  i whant know how the script verifica_user.php will recive the
information..

----
I still trying make one script when any user go create on account,,
first will verify if this account exist. If exist will appear on
message.. This accound still in use. Please choice another..

But i don't know how get the user still typing and pass from php
script, where will do this comparation..

Thanks