set jquery version for specific page (Drupal 6)

gistfile1.php

<?php
function theme_preprocess_page(&$vars) {

  $m_obj = menu_get_object();
  if ($m_obj->type == 'product_group') {
    // set jQuery 1.5.1 for slider
    $path_to_slider = drupal_get_path('module', "slider");
    drupal_set_html_head('<script type="text/javascript" src="'. base_path() . path_to_theme() .'/js/libs/jquery-1.5.1.min.js"></script>');
    drupal_set_html_head('<script type="text/javascript" src="'. base_path() . $path_to_slider .'/ContentFlow/contentflow.js" load="ML"></script>');
    drupal_add_js($path_to_slider ."/contentflow_trigger.js");
    drupal_add_css($path_to_slider ."/ContentFlow/contentflow.css");
    $vars['head'] = drupal_get_html_head();

    // remove standard jquery from drupal scripts array
    $scripts = drupal_add_js();
    unset($scripts['core']['misc/jquery.js']);
    $vars['scripts'] = drupal_get_js('header', $scripts);
  }
}
?>

In Drupal 7 you have to use hook_js_alter to achieve the same behaviour - http://drupal.stackexchange.com/questions/28820/how-do-i-update-jquery-to-the-latest-version-i-can-download