const ids = ["about", "maxwell"];

function toggle(toggled_id) {
  var toggled_element = document.getElementById(toggled_id);
  if (toggled_element.style.display === "none") {
    for (id of ids) {
      var element = document.getElementById(id);
      element.style.display = "none";
    }
    toggled_element.style.display = "block";
  } else {
    toggled_element.style.display = "none";
  }
}