Javascripts aren't working

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Hello,

My javascripts aren't working anymore. I've got a simple, to-top button at the bottom right of every webpage and my navigation collapses into a drop down menu on smaller screens. None of this works anymore. On smaller screens it now just shows a website tree, very ugly. You can check it out here:http://hoffmeistercoaching.nl

As I've been looking around, I read that scripts are called from the footer. I'm showing it below. Please help!

Here's my footer:

<?php     defined('C5_EXECUTE') or die("Access Denied."); ?>
</div>   
<footer>
   <div class="container">
      <div class="row">
         <div class="span3">
            <div class="footer-content">
               <?php         
                  $a = new GlobalArea('Footer1');
                  $a->display();
               ?>
            </div>
         </div>
         <div class="span9">
            <div class="footer-content">

 
JohntheFish replied on at Permalink Reply
JohntheFish
Check the browser developer console for error messages.

Here is a checklist of other things to check
http://www.concrete5.org/documentation/how-tos/editors/the-block-do...
MeisterCoach replied on at Permalink Reply
Thanks for the tip. There's an error: Uncaught ReferenceError: jQuery is not defined

I don't understand. Concrete5 loads jQuery right?
MeisterCoach replied on at Permalink Best Answer Reply
Ok, I solved it. A week ago I read somewhere to stop loading jQuery to speed up websites(see here:http://andrewembler.com/posts/5-easy-ways-to-speed-up-a-concrete5-s... I just did it without thinking about it.

I undid that and everything works fine again.