wordpress nav

gistfile1.txt

<?php
$location = 'top_nav';
if ( has_nav_menu( $location ) ) {
	$args = array(
		'theme_location'  => 'top_nav',
		'container'       => '',
		'container_class' => false,
		'menu_class'      => 'navigation_nav',
		'menu_id'         => 'top_navigation',
		'echo'            => true,
		'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</ul>',
		'depth'           => '1',
		'fallback_cb'     => 'wp_page_menu' );
          wp_nav_menu( $args ); 
                    $menu_to_count = wp_nav_menu(array(
                        'echo' => false,
                        'theme_location' => 'top_nav',
                        'depth' => '1'
                        ));
                    $menu_items = substr_count($menu_to_count,'class="menu-item ');
                    $amount = 100;
                    $liwidth = (float)$amount / (int)$menu_items;
} ?>
<style>
#top_nav .navigation_nav > li { width: <?php echo $liwidth; ?>%; }
</style>