напишыте ето в template.php

<?php
/**
* Helper function that builds the nested lists of a Nice menu.
*
* param $menu
* Menu array from which to build the nested lists.
* param $depth
* The number of children levels to display. Use -1 to display all children
* and use 0 to display no children.
* param $trail
* An array of parent menu items.
*/
function THEME_NAME_nice_menus_build($menu, $depth = -1, $trail = NULL) {
$output = '';
$index = 0;
$count = 0;
foreach ($menu as $menu_count) {
if ($menu_count['link']['hidden'] == 0) {
$count++;
}
}

foreach ($menu as $menu_item) {
$mlid = $menu_item['link']['mlid'];
// Check to see if it is a visible menu item.
if ($menu_item['link']['hidden'] == 0) {
//prepare marking of li tag as odd, even, first or last
$index++;
$first_class = $index == 1 ? ' first ' : '';
$oddeven_class = $index % 2 == 0 ? ' even' : ' odd';
$last_class = $index == $count ? ' last ' : '';

// Build class name based on menu path
// e.g. to give each menu item individual style.
// Strip funny symbols.
$clean_path = str_replace(array('http://', 'www', '<', '>', '&', '=', '?', ':'), '', $menu_item['link']['href']);
// Convert slashes to dashes.
$clean_path = str_replace('/', '-', $clean_path);
$class = 'menu-path-'. $clean_path;
if ($trail && in_array($mlid, $trail)) {
$class .= ' active-trail';
}
// If it has children build a nice little tree under it.
if ((!empty($menu_item['link']['has_children'])) && (!empty($menu_item['below'])) && $depth != 0) {
// Keep passing children into the function 'til we get them all.
$children = theme('nice_menus_build', $menu_item['below'], $depth, $trail);
// Set the class to parent only of children are displayed.
$parent_class = $children ? 'menuparent ' : '';
$output .= '

\n";
}
else {
$output .= '

'."\n";
}
}
}
return $output;
}
?>
Тут THEME_NAME имя темы

А ето в page.tpl.php файл

<?php theme_nice_menus_build($menu, $depth = -1, $trail = NULL) ?>