update jQuery Version in Drupal 7 for specific site

gistfile1.php

<?php
function MYMODULE_js_alter(&$javascript) {
  // check if we are on front_page
  if(drupal_is_front_page()) {
    $path = drupal_get_path('module', 'MYMODULE') . '/js/jquery-1.7.1.min.js';
    // Copy the current jQuery file settings and change
    $javascript[$path] = $javascript['misc/jquery.js'];
    // Update necessary settings
    $javascript[$path]['version'] = '1.7.1';
    $javascript[$path]['data'] = $path;
    // Finally remove the original jQuery
    unset($javascript['misc/jquery.js']);
  }
}