title: css property value contains variable
body: <p>How can I include a variable when setting a property value with less css. For example:</p>
  
  <p>I want to set the background image on the right or on the left based on the variable <code>@direction</code>.</p>
  
  <p>I've tried:</p>
  
  <pre><code>@direction:left;
  background: url(../../images/downarrow_blue.png) no-repeat @direction white;
  </code></pre>
  
  <p>but it does not work.</p>