Dynamic Menu Highlighting

Hi,
I’m looking for some help and would be grateful for some pointers.

I’ve implemented the dynamic menu highlighting following the the relevant codex article. I’ve managed to get the menu just as I want. However I’ve run into a problem with the conditional statements when I’ve added a sub menu to the original menu.

This additional submenu also needs highlighting just as the main menu, however I would like the main menu to keep the correct item highlighted.

For example if I’m looking at a page called Services which is highlighted, and within this page there are a range of sub menu items with the sub menu item highlighted that is currently being viewed.

I’ve implemented a sub menu that works fine, however I cant get the two working together. Here are my conditional statements.

<--This is for the main menu-->

<?php
if ( is_home('home') ) { $current = 'home'; }
elseif ( is_page('page 1') ) { $current = 'page 1'; }
elseif ( is_page('page 2') ) { $current = 'page 2'; }
elseif ( is_page('page 3') ) { $current = 'page 4'; }
elseif ( is_page('page 5') ) { $current = 'page 5'; }
elseif ( is_page('page 6') ) { $current = 'page 6'; }
?>

<!-- This is for the sub menu-->

<?php
if ( is_home('sub') ) { $current = 'sub'; }
elseif( is_page('sub 1') ) { $current = 'sub 1'; }
elseif ( is_page('sub 2') ) { $current = 'sub 2'; }
elseif ( is_page('sub 3') ) { $current = 'sub 3'; }
elseif ( is_page('sub 4') ) { $current = 'sub 4'; }
?>

Would be extremely grateful for some advice.

Lee