how to toggle show/hide text above as well as below

I am trying to create an acceptance button using the code provided below. I can not figure out how to hide the text above when the text below is shown. I know there are much easier ways to make an acceptance button but this is just how I wanna do mine. Any help on the topic would be greatly appreciated. I honestly don't even know what language this is to be exact. It looks like javascript to me but my friend tells me its not.

<script>
 /* This script is a custom script to control the 'show' / 'hide' extra feature.  
 To use: give each button you want to make an expander an href of "expand-3", if you want it to expand / collapse the next 3 blocks.

 Make sure to make each button say 'Show More' as its default text.
 */

 var SHOW_MORE = 'I Accept'
 var COLLAPSE = 'Show Agreement'
 $(window).load(function(){
   // prepares all buttons by wrapping the correct # of following divs into a div with class 'extra_gallery'
   $('a[href^="#expand"]').each(function(){
     // parse # of sibling elements to wrap from href attribute and then wrap them.
     var n = parseInt($(this).attr('href').split('-')[1]);
     var next_n_divs = $(this).parents('div.sqs-block').nextAll().slice(0,n)
     // this is the line that is different.  we use display:none; on the DOM element that wraps the additional gallery.
     next_n_divs.wrapAll('<div class="extra-gallery" style="display:none;"></div>');
/*      // preload_images
     next_n_divs.find('img').each(function(){
       image = new Image();
       image.src = $(this).attr('data-src')+'?format=500w';
       console.log($(this).attr('data-src'));
     });
     // control for click behavior
     */
     $(this).click(function(){
       var target_gallery = $(this).parents('div.sqs-block').next('div.extra-gallery')
       if (target_gallery.is(':visible')){
         $(this).text(SHOW_MORE);
       }
       else {
         $(this).text(COLLAPSE);
       }
       target_gallery.slideToggle();
       return false;
     });
   });
 });
</script>

Could you show us the current page that uses the code? or at least the name of the template

I attached a few screenshots showing what it does now as well as what my goal is.

Here is the forum I pulled the code from. hopefully it can offer some insight.

Thank you!

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiT0eqCstjsAhUNs54KHV5kBeEQFjAAegQIBRAC&url=https%3A%2F%2Fforum.squarespace.com%2Ftopic%2F49530-how-do-i-create-hideshow-section-of-an-entire-page-of-text-images-and-or-galleries-in-squarespace-spoiler-functionaccordiancollapse%2F&usg=AOvVaw1hjyjHHzyxbr5KlfWMdbhY

Hi there

i need to check your site to tweak the script to correct, you may want to enable temp password so I can have a look