title: jquery .keyup event on input not firing
body: <p>I am trying to have a simple addition calculation when an input is keyup'ed. Here is my html:</p>
  
  <pre><code>&lt;tr id="a"&gt;
          &lt;td&gt;
              &lt;label&gt;A&lt;/label&gt;
          &lt;/td&gt;
          &lt;td&gt;
              &lt;label&gt;Results/Action Orientation (asset)&lt;/label&gt;
          &lt;/td&gt;
          &lt;td class="shade"&gt;
              &lt;input id="a_per" type="text" /&gt;
          &lt;/td&gt;
          &lt;td class="shade"&gt;
              &lt;input id="a_pot" type="text" /&gt;
          &lt;/td&gt;
          &lt;td class="shade"&gt;
              &lt;input id="a_tot" class="totals" type="text" disabled="disabled" /&gt;
          &lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>And here is my jQuery for the keyup event:</p>
  
  <pre><code>$('#a_per').keyup(function() {
      if($('#a_pot').value != "") {
          var tot = this.value + $('#a_pot').value;
          $('#a_tot').value = tot;
      }
  });
  </code></pre>
  
  <p>I am going to tailor it to fire when either #a_per or #a_pot keyup but first I want to make sure this will work.</p>
  
  <p>Any help is appreciated. Thanks.</p>