PageOutput Object
$page_output is a global variable defined by the Horde_Framework.  It is used to format the output of dynamically generated pages.
<a href="http://dev.horde.org/api/master/lib/Core/classes/Horde_PageOutput.html">API Documentation</a>
Page Header
<pre><code class="language-php">
$page_output->header(array(
    'title' => _("List")
));
</code></pre>
Page Footer
<pre><code class="language-php">
$page_output->footer();
</code></pre>
Adding Javascript
Javscript file that lives in an application's js/ directory
<pre><code class="language-php">
// $page_output->addScriptFile($name_of_file_relative_to_base_of_js_directory, $app_name);
// Example, for Horde:
$page_output->addScriptFile('login.js', 'horde');
</code></pre>
External Javascript file
<pre><code class="language-php">
// The file MUST be web accessible.
$page_output->addScriptFile(
    new Horde_Script_File_External($relative_URI_to_JS_file) 
);
</code></pre>
Adding inline Javascript code
<pre><code class="language-php">
$page_output->addInlineScript(
    $javascript_code,
    true
);
</code></pre>
<a href="https://wiki.horde.org/PageOutput">PageOutput</a> defaults
Depending on the presentation type (smartmobile, dynamic, basic), <a href="https://wiki.horde.org/PageOutput">PageOutput</a> automatically includes some appropriate javascript environment.<br />
In Horde 5, dynamic mode is based on <a href="https://wiki.horde.org/PrototypeJs">PrototypeJs</a> and smartmobile is based on jquery-mobile.<br />
See <a href="https://wiki.horde.org/Doc/Dev/HordeAjaxApplications">Ajax Application Docs</a> for more details on available environment.