title: Jquery IsNumeric with a not condition
body: <p>I am using Jquery to check to see if something isNumeric.
  How do I check to see if it is not numeric?</p>
  
  <pre><code>    if  (IsNumeric($('#Amount').val())) { .....
  </code></pre>
  
  <p>I put a ! before IsNumeric but that did not work.</p>