title: scroll to top is not smooth enough
body: <p>i am using this script for scroll to top button:</p>
  
  <pre><code>$(document).ready(function(){
      $(".upp").click(function(){
          $('html, body').animate({scrollTop: '0px'}, 1200);
      });
  });
  </code></pre>
  
  <p>It is going to top while being animated, but the animation is not smooth enough.it jumps at some parts, then slides to top. I even tried increasing the value from 1200 to 5000, but it scrolls while jumping at certain points. i am using simple jquery library (latest version).Do you think that adding jquery UI will solve anything? please help.</p>