Afiicher une photo

<p>
        <select name="rang" onchange="select_fct(this);">
           <option selected="selected" disabled>Quel brassard ?</option>
          <option value="brass_1">1</option>
          <option value="brass_2">2</option>
        </select>
        </p>
<p><img id="img"/>
          
  <script type="text/javascript">
var l_image = {
  brass_2 : "images/img1.jpg",
  brass_1 : "images/img2.jpg" 
};
 
function select_fct(select) {
  var valeur = select.options[select.selectedIndex].value;
  document.getElementById("img").src = l_image[valeur];
}
  </script>