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Replace textfield value on ajax callback

1) Am i missing something here? it’s not replacing the textfield value.
2) Also how do i replace if i have a multiple textfield and multiple button in a form. 

<?php     function test($form, &$form_state) {       if (isset($form_state['values']['your_name'])) {         $name_value = $form_state['values']['your_name'];       }       else {         $name_value = "";       }        $form = array();       $form['your_name'] = array(         '#title' => t('Your or your company name'),         '#type' => 'textfield',         '#value' => $name_value,         '#prefix' => '<div id ="subscribers-name">',         '#suffix' => '</div>',       );       $form['load_settings'] = array(         '#type' => 'button',         '#value' => t('Load my settings'),         '#ajax' => array(           'wrapper' => 'subscribers-name',           'callback' => 'simplenews_mod_load_subscriptions_ajax',           'method' => 'replace',         )       );       return $form;     }      function simplenews_mod_load_subscriptions_ajax($form, &$form_state) {       $form_state['values']['your_name'] = "loaded value";       return $form['your_name'];     }
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Replace textfield value on ajax callback

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