title: Javascript positioning
body: <p>I have a problem with positioning a Hello Bar. In the CSS, it's relative which pushed the site down. To fix this, I use this javascript function:</p>
  
  <pre><code> &lt;script language="javascript"&gt;
   $(window).scroll(function(){
   var $this = $(this);
   $("#hello_bar").css("position", "fixed");
   $('#hello_bar').css('position', "absolute" - $this.scrollTop());
   });
   &lt;/script&gt;
  </code></pre>
  
  <p>If I scroll down the page and get back up to site top than the content is behind the Bar.. How can I fix this?</p>