Optimise large IF Statement

Hi im displaying a different sub menu acccording to to a page id or parent page id, using an IF statement. THis works perfectly, I was just wondering if there was possibly a way to optimise it, perhaps using a SWITCH statement. I wasnt sure how to add the IR OR into a Switch statement.

Here is the IF Statemenr:

<!-- Show sub nav menus according to top level campaign page -->
		<?php  if ( is_page('110')  || $post->post_parent == '110' ) { ?>
				<div id="subMenu">
				<nav role="navigation">
		<?php //wp_nav_menu('menu=VAT'); ?>
		<?php
			$defaults = array(
				'menu'            => 'VAT',
				'container'       => 'false',
				'menu_class'      => 'nav',

			);

			wp_nav_menu( $defaults );
		?>
				</nav>
				</div>

		<?php } elseif ( is_page('108')  || $post->post_parent == '108' ) {?>
			<div id="subMenu">
				<nav role="navigation">
		<?php //wp_nav_menu('menu=VAT'); ?>
		<?php
			$defaults = array(
				'menu'            => 'ECONOMY',
				'container'       => 'false',
				'menu_class'      => 'nav',

			);

			wp_nav_menu( $defaults );
		?>
				</nav>
				</div>
		<?php } elseif ( is_page('115')  || $post->post_parent == '115' ) {?>
<div id="subMenu">
				<nav role="navigation">
		<?php //wp_nav_menu('menu=VAT'); ?>
		<?php
			$defaults = array(
				'menu'            => 'FOOD',
				'container'       => 'false',
				'menu_class'      => 'nav',

			);

			wp_nav_menu( $defaults );
		?>
				</nav>
				</div>				

		<?php } ?>

Many Thanks in advance.
Mark