Two lists in main header nav instead of two.

I’m trying to get my nav to look like this –

http://img.photobucket.com/albums/v654/coopermor/helpwithnav.png

I think (but there’s a 99% chance that I’m wrong) I have to change this line

<?php wp_list_pages('sort_column=menu_order&depth=1&title_li='); ?>

so that it only creates two lists items and then another line that creates the subsequent three.

Could someone tell me how I could do this? Thanks!

Edit: This may be in the may be in the wrong section, sorry.