title: How do I use jQuery .each() to find a child's children?
body: <p>Given many TABLE tags on a page, how do I select the TD childred on a selected table.</p>
  
  <p>This is logical, but fails with this error:</p>
  
  <pre><code>Error: uncaught exception: Syntax error, unrecognized expression: [object Object]tr
  </code></pre>
  
  <p>My code</p>
  
  <pre><code>$(document).ready(function () {
      var selectedTable = $('table').eq('9');
  
      $(selectedTable).css('border','10px solid green');
  
      $(selectedTable + 'tr td').each(function(i) {
          $(this).css('border','10px solid blue');
      });
  
  });
  </code></pre>