drupal 7 menu link with unquid #id funnction

gistfile1.aw

<?php
function theme_menu_link($variables) {
  $element = $variables['element'];
  //changes
  $element['#attributes']['id'] = 'mlink-' . $element['#original_link']['mlid'];
  // standard output;
  $sub_menu = '';

  if ($element['#below']) {
    $sub_menu = drupal_render($element['#below']);
  }
  $output = l($element['#title'], $element['#href'], $element['#localized_options']);
  return '<li' . drupal_attributes($element['#attributes']) . '>' . $output . $sub_menu . "</li>\n";
}