Why are my submenus appearing above the main menu?

Hi, I am trying to output the submenus underneath each main menu that they belong to.   It outputs them just not in the right place.  The submenus appear above the regular menu:

function menu() {
	$menus = get_menu();
	$output = "";
	while($menu = mysql_fetch_assoc($menus)) {
		$output .= "<li><span></span><a href=\"" . $menu['blurb'] . ".php?menu=" . urlencode($menu['id']) . "\">" . 
					$menu['title'] . "</a>";
		echo submenus($menu['id']);
		$output .= "</li>";
	}	
	return $output;
}
function submenus($menu_id) {
	$submenus = get_submenu($menu_id);
	$output = "<ul class=\"ul_1\">";
	while ($submenu = mysql_fetch_assoc($submenus)) {
		$output .= "<li><a href=\"" . $submenu['blurb'] . ".php?submenu=" . urlencode($submenu['id']) . "\">" . $submenu['title'] . "</a>";
		// next submenus
		$output .= "</li>";
	}
	$output .= "</ul>";
	return $output;
}

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Any suggestions?

http://gowiththemaster.com/tleithoff/test.php