Problem with upload images

function my_admin_scripts() {
		wp_enqueue_script('media-upload');
		wp_enqueue_script('thickbox');
		wp_register_script('my-upload', plugins_url('tz_background/assets/js/my-script.js'), array('jquery', 'media-upload', 'thickbox'));
		wp_enqueue_script('my-upload');
	}

function my_admin_styles() {
	wp_enqueue_style('thickbox');
}

if (isset($_GET['page']) && $_GET['page'] == 'tz-backgraund-plugin') {
	add_action('admin_print_scripts', 'my_admin_scripts');
	add_action('admin_print_styles', 'my_admin_styles');
}<code>and my-script.js</code>(function($) {
	$('document').ready(function() {

	$('#upload_image_button').click(function() {
		formfield = $('#upload_image').attr('name');
		tb_show('', 'media-upload.php?type=image&TB_iframe=true');
		return false;
	});

	window.send_to_editor = function(html) {
		imgurl =$('img', html).attr('src');
		$('#upload_image').val(imgurl);
		tb_remove();
	}
	});
}(jQuery));