title: jQuery inArray() locating HTML element
body: <p>Say,I have 5 paragraphs in the page.</p>
  
  <p>if I execute:</p>
  
  <pre><code>p_array=$('p');
  second_p=$('p:eq(1)');
  $.inArray(second_p,p_array);
  </code></pre>
  
  <p>I get -1.
  Any explanation?</p>