title: jQuery variable element syntax
body: <p>I use the same element in my function several times.
  For example:</p>
  
  <pre><code>var myElement = jQuery('#some_div_with_good_id');
  var myChildren = jQuery('#some_div_with_good_id span');
  </code></pre>
  
  <p>So how I can optimize this code for shorten second variable?
  I tried:</p>
  
  <pre><code>var myChildren = jQuery(myElement, 'span');
  </code></pre>
  
  <p>but this not works :(
  I'm new in jQuery, so sorry if you think it is stupid question.</p>