Filter to apply a div before menu output

wrapper.php

<?php
function tumble_menu( $args = array() ) {
	/* Default arguments */
	$defaults = array(
		'container' 		=> 'ul',
		'menu_class' 		=> 'nav',
		'menu_id'			=> 'top_nav',
		'theme_location' 	=> 'top-menu',
		'echo' 				=> false,
		'before' 			=> '',
		'after' 			=> '',
		'link_before' 		=> '',
		'link_after' 		=> '',
		'depth' 			=> 1,
		'sort_column'		=> 'menu_order',
		'walker'			=> ''
		);
	$defaults 	= apply_filters( 'tumble_nav_default_args', $defaults);
	$args 		= wp_parse_args( $args, $defaults );

	$main_menu = wp_nav_menu( $args );
}
function tumble_add_menu_wrapper($html, $begin, $end) {
	// wrap our original HTML with the new tags
	return $begin . $html . $end;
}
add_filter( 'tumble_menu_wrap', 'tumble_add_menu_wrapper', 10, 3 );

function tumble_do_menu_wrapper() {
	$html = tumble_menu();
	echo apply_filters( 'tumble_menu_wrap', $html, '<div class="menu-button">Menu</div>','' );
}
?>

updated the site with the new code, does the same thing, menu under ul