title: jQuery offset() returns null
body: <p>Why does my code not return the top and left values?
  Instead returns null. Does there need to be some values set already for offset(); to work?</p>
  
  <pre><code>var divOrg = $( "#portfolioButton" );
  var pos = divOrg.offset();
  console.log( "left : " + pos.left + ", top : " + pos.top );
  </code></pre>