Script de scroll infinito en Category/list

jsInfiniteScroll.html

<script type="text/javascript">
//<![CDATA[

function sendLoadMoreProductsRequest() {
  
  if ($$('.next').first()) {
    
    var url = $$('.next').first().readAttribute('href');
    
    $$('.product-loading a').first().hide();
    
    $$('body').first().innerHTML += '<div id="ajax-loading"><div class="uil-ripple-css" style="-webkit-transform:scale(0.75)"><div></div><div></div></div></div>';
    
    new Ajax.Request (url, {
      method: 'get',
      onSuccess: function (response) {
        var div = document.createElement('div');
        div.innerHTML = response.responseText;
        $$('.pages').first().innerHTML = $(div).select('.pages').first().innerHTML;
        $$('.product-list').first().innerHTML += $(div).select('.product-list').first().innerHTML;
        
        $('ajax-loading').remove();
        
        if ($(div).select('.product-loading').length > 0) {
          $$('.product-loading a').first().innerHTML = $(div).select('.product-loading a').first().innerHTML;
          $$('.product-loading a').first().show();
        } else {
          $$('.product-loading').first().remove();
        }
      }
    });
  }
}

//            Event.observe(window, "load", function () {
//                window.scrollTo(0, 0);
//            });
//]]>
</script>

jsInfiniteScroll.js

function sendLoadMoreProductsRequest() {
  
  if ($$('.next').first()) {
    
    var url = $$('.next').first().readAttribute('href');
    
    $$('.product-loading a').first().hide();
    
    $$('body').first().innerHTML += '<div id="ajax-loading"><div class="uil-ripple-css" style="-webkit-transform:scale(0.75)"><div></div><div></div></div></div>';
    
    new Ajax.Request (url, {
      method: 'get',
      onSuccess: function (response) {
        var div = document.createElement('div');
        div.innerHTML = response.responseText;
        $$('.pages').first().innerHTML = $(div).select('.pages').first().innerHTML;
        $$('.product-list').first().innerHTML += $(div).select('.product-list').first().innerHTML;
        
        $('ajax-loading').remove();
        
        if ($(div).select('.product-loading').length > 0) {
          $$('.product-loading a').first().innerHTML = $(div).select('.product-loading a').first().innerHTML;
          $$('.product-loading a').first().show();
        } else {
          $$('.product-loading').first().remove();
        }
      }
    });
  }
}

//            Event.observe(window, "load", function () {
//                window.scrollTo(0, 0);
//            });