(function(jq) {

         jq.autoScroll = function(ops) {

         ops = ops || {};

         ops.styleClass = ops.styleClass || 'scroll-to-top-button';

         var t = jq('<div class="'+ops.styleClass+'"></div>'),

            d = jq(ops.target || document);

         jq(ops.container || 'body').append(t);



         t.css({

            opacity: 0,

            position: 'absolute',

            top: 0,

            right: 0

         }).click(function() {

            jq('html,body').animate({

               scrollTop: 0

            }, ops.scrollDuration || 1000);

         });



         $(window).scroll(function(){

            var sv = d.scrollTop();

            if (sv < 10) {

               t.clearQueue().fadeOut(ops.hideDuration || 200);

               return;

            }



            t.css('display', '').clearQueue().animate({

               top: sv,

               opacity: 0.8

            }, ops.showDuration || 500);

         });

      };

   })(jQuery);



   $(document).ready(function(){

      $.autoScroll({

         scrollDuration: 2000, 

         showDuration: 600, 

         hideDuration: 300

      });

   });