[jQuery] Validate + Captcha + Remote

[jQuery] Validate + Captcha + Remote


Hi,
I use captcha to prevent spam in this way (token is a random string
needed to validate user input field)
var token = 'somerandomstring';
$(".myform").validate({
            rules: {
                captcha: {
                    required: true,
                    remote: "/captcha.php?t="+token
                }
            }
});
Now i need to refresh che captcha code, so I call this function:
function newCaptcha()
{
    $.getJSON("/newCaptcha.php", function(data){
        token = data.t;
// some stuff
    });
}
Why the validator doesn't use the new token?