Pasted

<div id="viewer"><center style="padding:100px"><i class="fa fa-spinner fa-3x fa-spin"></i></div>
      <script>
        function replaceAll(str, find, replace) {
          return str.replace(new RegExp(escapeRegExp(find), 'g'), replace);
        }
        function escapeRegExp(str) {
            return str.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
        }
         $(function(){
            $.get("{{ webviewer_url }}", function(data, status){
                document.getElementById('viewer').innerHTML = replaceAll(data, '{{ webviewer_local_directory }}/cache', '{{ webviewer_url }}/cache/');
            });
        });
    </script>