Refresh DIV using WordPress AJAX.

Hello, i have website where i am deleting something. And i am also showing total number of records somewhere at the top of the page.

now what i want to do is that when i delete my record. i also want to refresh that div. so i can get exact number of records..

what is happening right now is that when i delete the record using AJAX it is working but it is not refreshing my number of total records. i have to refresh the page that i can see the exact total records..

does anyone know how to do this? i am using wordpress AJAx function..

This is my delete funtion

if( !function_exists( 'delete_post_item' ) )
{

	add_action( 'wp_ajax_nopriv_delete_post_item', 'delete_post_item' );
	add_action( 'wp_ajax_delete_post_item', 'delete_post_item' );

	function delete_post_item()
	{
		$post_id = $_POST['post_id'];

		if($post_id != '')
		{
			global $wpdb;
			$delete_query = "delete query ";
                        $wpdb->query($delete_query);
		}

		$response = array(
			   'what'=>'foobar',
			   'action'=>'update_something',
			   'id'=>'1',
			   'data'=>$post_id
			);
			$xmlResponse = new WP_Ajax_Response($response);
			$xmlResponse->send();
	}

}//endif;

please can anyone know how to do that?
how can i refresh div1 and div2..