display third level navigation SOLVED

I had trouble displaying 3rd level navigation menus to display as sperate nav components and worked it thusly:

<?php if(count(get_post_ancestors($post->ID))>1){?>
<ul id="subsubnav">
	<?php wp_list_pages("title_li=&child_of=".$post->post_parent."&depth=1" );?>

<?php }?>

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Could be used for any level of navigation I guess, just change the count test in the if statement. I am displaying 2nd and 3rd level nav systems on subpages, the full code for both is:

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Thought this might be helpful to others ?? Seems pretty efficient too.