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Append Fields to node form by ajax call

I have a node form with some fields, now I want to append some more fields to it on an ajax callback. in the ajax page I have rendered the new form elements with drupal_render function
My problem is that I am not getting the newly built form fields in POST or form_state. Shall I use AHAH or can I continue with this ajax calls? 

$form['country'] = array(              "#type"=>"select",                '#title'    =>t('Ship To'),              '#required' => true ,             '#options' => $options,             '#weight' =>10,             '#attributes' =>  array('id' => $cn_var),         );         $form['dyn_cost'] = array(              "#type"=>"textfield",                '#title'    =>t('Shipping Cost'),                '#required' => true ,             '#size' =>25,             '#weight' =>11,             '#id' =>  $co_var,         );          print drupal_render($form);         exit;

This is my ajax form and it is supposed to be appending to the node form.

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Append Fields to node form by ajax call

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