Problem with saving more checkboxes in theme options

I’m creating some theme options and settings using ajax. Everything was working fine. But now when I’m trying to add more check box options they won’t be saving. Please have a look in the following code, save it as a php file in your theme directory and include in your theme fucntions. Then access thru Appearence-> Creativ3D options.

<?php
add_action('admin_menu', 'creative_add_theme_page');

function creative_add_theme_page() {
	if ( isset( $_GET['page'] ) && $_GET['page'] == basename(__FILE__) ) {

		add_action('admin_head', 'creative_theme_page_head');
	}
	add_theme_page(__('Creativ3D Options'), __('<strong style="color:#ff0000;">Creativ3D</strong> Options'), 'edit_theme_options', basename(__FILE__), 'creative_settings_page');
}

function creative_theme_page_head() {
?>
<script type="text/javascript">
	jQuery(document).ready(function($) {

	  jQuery('form#creative_form').submit(function() {
		  var data = jQuery(this).serialize();
		  jQuery.post(ajaxurl, data, function(response) {
			  if(response == 1) {
				  show_message(1);
				  t = setTimeout('fade_message()', 2000);
			  } else {
				  show_message(2);
				  t = setTimeout('fade_message()', 2000);
			  }
		  });
		  return false;
	  });

	});

	function show_message(n) {
		if(n == 1) {
			jQuery('#saved').html('<div id="message" class="updated fade"><p><strong><?php _e('Creativ3D Options saved.'); ?></strong></p></div>').show();
		} else {
			jQuery('#saved').html('<div id="message" class="error fade"><p><strong><?php _e('Creativ3D Options could not be saved.'); ?></strong></p></div>').show();
		}
	}

	function fade_message() {
		jQuery('#saved').fadeOut(1000);
		clearTimeout(t);
	}
</script>

<?php
}

function creative_settings_page() {
?>

<div class="wrap">
	<h2 style="margin-bottom:10px;"><span style="color:#ff0000;">Creativ3D</span> Options</h2>

    <div id="saved"></div>
    <?php $options = get_option('creative_theme'); ?>
    <form action="/" name="creative_form" id="creative_form">

    <table class="form-table">
        <tr valign="top">
        <th scope="row">Call Us text and phone #: </th>
        <td><input type="text" name="creative_phone" value="<?php echo $options['creative_phone']; ?>" size="110" /></td>
        </tr>

        <tr valign="top">
        <th scope="row">Contact Email: </th>
        <td><input type="text" name="creative_email" value="<?php echo $options['creative_email']; ?>" size="110" /></td>
        </tr>

        <tr valign="top">
        <th scope="row">Display logo on top: </th>
        <td><input type="checkbox" name="creative_check" <?php echo ($options['creative_check'] == 'on') ? 'checked="checked"' : ''; ?>  /></td>
        </tr>

        <tr valign="top">
        <th scope="row">Display the top contact form on the home page: </th>
        <td><input type="checkbox" name="top_contact" <?php echo ($options['top_contact'] == 'on') ? 'checked="checked"' : ''; ?>  /></td>
        </tr>

   </table>
        <input type="hidden" name="action" value="creative_theme_data_save" />
        <input type="hidden" name="security" value="<?php echo wp_create_nonce('creative-theme-data'); ?>" />
        <p class="submit"><input type="submit" value="Submit"  /></p>
    </form>
</div>

<?php
}

add_action('wp_ajax_creative_theme_data_save', 'creative_theme_save_ajax');

function creative_theme_save_ajax() {

	check_ajax_referer('creative-theme-data', 'security');

	$data = $_POST;
	unset($data['security'], $data['action']);

	if(!is_array(get_option('creative_theme'))) {
		$options = array();
	} else {
		$options = get_option('creative_theme');
	}

	if(!empty($data)) {
		$diff = array_diff($options, $data);
		$diff2 = array_diff($data, $options);
		$diff = array_merge($diff, $diff2);
	} else {
		$diff = array();
	}

	if(!empty($diff)) {
		if(update_option('creative_theme', $data)) {
			die('1');
		} else {
			die('0');
		}
	} else {
		die('1');
	}
}
?>

Why the checkbox $options['top_contact'] not saving? Please someone assist me.