"Infinite" scrolling in Shopify collections

collections.liquid.html

    {% paginate collection.products by 20 %}
    <!-- the top of your collections.liquid -->
    
    <!-- START PRODUCTS -->
    {% for product in collection.products %}
    	    <!-- START PRODUCT {{ forloop.index | plus:paginate.current_offset }} -->
    	    <div class="product" id="product-{{ forloop.index | plus:paginate.current_offset }}">
                {% include 'product' with product %}
            </div> 
    	    <!-- END PRODUCT {{ forloop.index | plus:paginate.current_offset }} -->
    {% endfor %}
	
    {% if paginate.next %}
        <div id="more"><p>&darr; <a href="{{ paginate.next.url }}">More</a></p></div>        
    {% endif %}

    <div id="product-list-foot"></div>
    <!-- END PRODUCTS -->
    
    <!-- the bottom of your collections.liquid -->
    {% endpaginate %}

theme.liquid.js

    {% if template contains 'collection' %}
         function ScrollExecute() {
           if($(document).height() - 800 < ($(document).scrollTop() + $(window).height())) {
               scrollNode = $('#more').last();    
               scrollURL = $('#more p a').last().attr("href");
               if(scrollNode.length > 0 && scrollNode.css('display') != 'none') {
                   $.ajax({
                       type: 'GET',
                       url: scrollURL,
                       beforeSend: function() {
                           scrollNode.clone().empty().insertAfter(scrollNode).append('<img src=\"{{ "loading.gif" | asset_url }}\" />');
                           scrollNode.hide();
                       },
                       success: function(data) {
                           // remove loading feedback
                           scrollNode.next().remove();
                           var filteredData = $(data).find(".product");
                           filteredData.insertBefore( $("#product-list-foot") );                   
                       },
                       dataType: "html"
                   });
               }
           }
         }
 
         $(document).ready(function () {
           $(window).scroll(function(){
               $.doTimeout( 'scroll', 200, ScrollExecute);
           });
         });
    {% endif %}