title: HighCharts - Negative $ currency values
body: <p>I'm trying to format the y-axis and tooltip to add a dollar sign before values, using the labels formatter: </p>
  
  <pre><code>labels: {
              formatter: function () {
                  return '$' + this.value;
              },
  </code></pre>
  
  <p>Which works a little too well. If I have a negative currency value, the '$' appears <em>before</em>  the negative sign. </p>
  
  <p>How should the dollar sign be added so that it appears after the negative sign for negative values? </p>
  
  <p>I apparently do not have enough points to post an image of what I'm talking about, so see an example here: <a href="http://jsfiddle.net/elizabeth_shell/p6GDk/10/" rel="nofollow">http://jsfiddle.net/elizabeth_shell/p6GDk/10/</a></p>
  
  <p>Thanks in advance!</p>