function branchChange(id) {
  var img = document.getElementById("i"+id);
  var parent = document.getElementById("n"+id);
  var children = parent.getElementsByTagName('li');
  var i, a;
  for (i = 0; i < children.length; i++) {
    if (children[i].style.display == 'none') {
      children[i].style.display = 'block';
      img.src = 'kernel/images/admin/treeopen.gif';
    } else {
      children[i].style.display = 'none';
      img.src = 'kernel/images/admin/treeclose.gif';
    }
  }
} // branchChnge()