[wp-hackers] Adding class to first menu item of submenu in wp_nav_menu

[Gavin Pearce]

Evening all,

Just wondering if any of you kind ladies and gentleman has found a way to add a "first" class, to the first item of each submenu within a menu generated by wp_nav_menu.

Adding a class to the first ever li is easy (preg_replace on menu-item x1), adding it to the first li "under" each and every submenu UL has confused me, without going into stupidly complex preg_replaces.

E.g.   (look for the FIRST's) ::

<ul>
	<li class="menu-item">Home</li>
	<li class="menu-item">Page1
		<ul class="submenu">
			<li class="FIRST menu-item">Subpage 1</li>
			<li class="menu-item">Subpage 2</li>
		</ul>
	</li>
	<li class="menu-item">Page3</li>
	<li class="menu-item">Page4
		<ul class="submenu">
			<li class="FIRST menu-item">Subpage 1</li>
			<li class="menu-item">Subpage 2</li>
		</ul>
	</li>
</ul>


Gav