function indent(e) {
  if (e.target) {
    s = e.target.parentNode.childNodes[1].src;
    e.target.parentNode.childNodes[1].src = s.replace("pipe", "flat");
  } else if (e.srcElement) {
    s = e.srcElement.src
    e.srcElement.src = s.replace("pipe", "flat");
  }
}

function outdent(e) {
  if (e.target) {
    s = e.target.parentNode.childNodes[1].src;
    e.target.parentNode.childNodes[1].src = s.replace("flat", "pipe");
  } else if (e.srcElement) {
    s = e.srcElement.src
    e.srcElement.src = s.replace("flat", "pipe");
  }
}