$group_counts = 6;  // The number of entries per menu
    $tree_array = array_filter(explode("\n", $tree) , "trim");
    $str_trees = "";
    $leafs = array();
    $tree_count = 0;

    foreach($tree_array as $li_entry){
      $leafs[] = $li_entry;
      if (count($leafs) == $group_counts){
        $str_trees .= "\n<ul class=\"menu tree-". ++$tree_count ." \">\n". implode("\n", $leafs) ."\n</ul>\n";
        $leafs = array(); // reset the leafs on this tree
      }
    }

    // Clean up any straggelers
    if (count($leafs)){
      $str_trees .= "\n<ul class=\"menu tree-". ++$tree_count ." \">\n". implode("\n", $leafs) ."\n</ul>\n";
      $trees = array();
    }

    return $str_trees;