<?php 
function theme() {
  static $functions;
  $args = func_get_args();
  $function = array_shift($args);

  if (!isset($functions[$function])) {
    $functions[$function] = theme_get_function($function);
  }
  if ($functions[$function]) {
    //return call_user_func_array($functions[$function], $args);
    $output = call_user_func_array($functions[$function], $args);

    /** You can enable the below line to remove all of these comments */
    //return $output;

   /** I use this switch to exlude certain functions which cause issues with some AJAX/JS/Forms */
    switch($functions[$function]) {
       case 'theme_nodereference_item_simple':
       case 'theme_markup':
       case 'theme_tinymce_theme':
          return $output;
    }
    return !empty($output) ? '<!-- tbegin ' . $functions[$function] . ' -->' . $output . '<!-- tend ' . $functions[$function] . ' -->' : $output;
  }
}
?>