Adding image uploader to api setting page.

Hi, I am doing api setting page for background image. An user can upload or update the existing background image. I would like to know how to add an image uploader into api setting page. I have written my code below.
` <?php
/*
Plugin Name: background
*/

function array_example_theme_test() {
add_theme_page(‘Mulltitple array Test’,’Mulltitple array Test’,’administrator’,’mulltiple_array_test’,’mullarray_display_test’);
}
add_action( ‘admin_menu’, ‘array_example_theme_test’ );

function mullarray_display_test() {
if ( !empty( $_FILES ) ) {
require_once(ABSPATH . ‘wp-admin/includes/admin.php’);
$uploadedfile = $_FILES[‘mullti_arr_display_test’];
$upload_overrides = array( ‘test_form’ => false );
$movefile = wp_handle_upload( $uploadedfile, $upload_overrides );
}

?>
<div class=”wrap”>
<div id=”icon-themes” class=”icon32″></div>
<h2>Sandbox Theme Test</h2>
<?php settings_errors(); ?>
<form method=”post” action=”options.php” enctype=”multipart/form-data”>
<?php settings_fields( ‘upload_display_test’ ); ?>
<?php do_settings_sections( ‘upload_display_test’ ); ?>
<?php submit_button(); ?>
</form>
</div>
<?php
}

function mullti_initialize_theme_test() {
add_settings_section(‘general_settings_test’,’Background’,’background_test_callback’,’upload_display_test’);

add_settings_field(‘show_test’,’Background image’,’bgimg_test_callback’,’upload_display_test’,’general_settings_test’);

register_setting(‘upload_display_test’,’upload_display_test’);

}
add_action(‘admin_init’, ‘mullti_initialize_theme_test’);

function background_test_callback(){
echo ‘<p>Select an image to display as a background image.</p>’;
}

function bgimg_test_callback(){
$options = get_option(‘upload_display_test’);

?>
<input name=”upload_display_test[img_upload]” type=”file” id=”show_test” size=”50″ />

<?php

}

?>
`
Please help me somebody.

Thanks in advance.