Почему мой <сценарий> не отмечает работу из php файла? (jQuery, включенный здесь также)

Make sure that you have that within either or of the HTML page. Also, I'd double check the path to the .js file. You could do that by pasting "pageControl.js" at the root of your web address.

It probably isn't looking where you think it is looking to grab your javascript file.

Try a server-relative format like this:

<script src="/some/path/to/pageControl.js"></script>

If that still isn't working, verify that you can type the url to your script file into your browser and get it to download.