For posting images you should use the wordpress function media_handle_upload
<?php if (isset($_FILES['text-two']))
require_once(ABSPATH . "wp-admin" . '/includes/image.php');
require_once(ABSPATH . "wp-admin" . '/includes/file.php');
require_once(ABSPATH . "wp-admin" . '/includes/media.php');
$attach_id = media_handle_upload( $_FILES['text-two'], $post_id );
update_post_meta($post_id,'textTwo', $attach_id));
?>
Also check this function wp_handle_uploadhttp://codex.wordpress.org/Function_Reference/wp_handle_upload to handle uploads in wordpress
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