title: scroll down on click with animations
body: <p>I have html page. And I want to scroll down on button click ( button has class  "s_down_button" ) with animation.</p>
  
  <p>I need scroll screen on element_height + 20 pixels down.</p>
  
  <p>element_height - height of element with "tp-bgimg"  class</p>
  
  <p>So I try:</p>
  
  <pre><code>jQuery(document).ready(function($) {
  
      $(".s_down_button").click(function(){
          var element_height = $(".tp-bgimg").height();
          var scroll_height = element_height +20;
          $('body').scrollTo(scroll_height);
      }); 
  
  });
  </code></pre>
  
  <p>but I get an error:</p>
  
  <pre><code>Uncaught TypeError: $(...).scrollTo is not a function
  </code></pre>