is that possible, without javascript hacks?
like this:
<ul class="my_menu">
<li class="first"> ... </li>
<li> ... </li>
<li> ... </li>
<li class"with_sub"> ...
<ul class="my_menu_sub">
<li class="first"> ... </li>
<li> ... </li>
<li> ... </li>
<li class="last"> ... </li>
</ul>
</li>
<li> ... </li>
<li> ... </li>
<li class="last"> ... </li>
</ul>
A better and simpler approach:
function add_first_and_last($items) {
$items[1]->classes[] = 'first-menu-item';
$items[count($items)]->classes[] = 'last-menu-item';
return $items;
}
add_filter('wp_nav_menu_objects', 'add_first_and_last');