function BuildList()
{
  var hs = document.getElementById("categorie").getElementsByTagName("span");
  for ( var i=0; i<hs.length; i++ )
  {
    hs[i].onclick = function() 
                    {
                      if(this.parentNode.className != "show")
                      {
                        this.parentNode.className = "show";
                        if ( prev )
                        {
                          if ( prev != this.parentNode )
                          {
                            prev.className = "hide";
                          }
                        }
                        var prev = this.parentNode;
                      }
                      else
                      {
                        this.parentNode.className = "hide";
                      }
                   }
  }
}