#AHAH submit then redirect ??

Hello,

This maybe a topic repost, but i couldn't find any records of the same thread or topic in google..

well heres my problem;

Im using ahah submit to enable the progress bar; because updating 1500++ records and initiating about 3000++ queries it could take awhile when a user click on the submit button; HENCE
i've implemented an ahah submit button code below;
---------------
$form['target'] = array(
'#type' => 'markup',
'#prefix' => '',
'#value' => t('To Synchronise your CLI address allocation please click Upload below.'),
'#suffix' => '',
);

$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Upload'),
'#ahah' => array(
'event' => 'click',
'path' => 'esa/clicron/usermulti',
'wrapper' => 'target',
'effect' => 'fade',
'progress' => array('type' => 'bar', 'message' => t('Please wait...'), 'interval' => 0, 'url' => $progressURL.'esa/cron/progress') ,
),
---------------
Once submitted and all the processes have been executed the end code would be this & progress is 100%;
--------
.......

$output = t("Done");

drupal_json(array('status' => TRUE, 'data' => $output));
----------

i understand that by doing this it will only change the content in the div box (class=Target)

What i really want is to redirect it back to the main page or redirect it somewhere;

I tried drupal_goto + form_state['redirect'] will also wont work

any idea. Hope im not too vague

Thanks in Advance :D