function turn_on (el, lbl) {
  elem = document.getElementById (el);
  elem.src = "images/menu-" + el + lbl + "-on.png";
}

function turn_off (el, lbl) {
  elem = document.getElementById (el);
  elem.src = "images/menu-" + el + lbl + ".png";
}

/*
function turn_on (el) {
  elem = document.getElementById (el);
  elem.style.backgroundColor = "#C3C9C8";
}

function turn_off (el) {
  elem = document.getElementById (el);
  elem.style.backgroundColor = "#D9DEDD";
}
*/

function toggledropdown () {
  elem = document.getElementById ("features-dropdowndist");
  elem.style.visibility = "hidden";

  elem = document.getElementById ("features-dropdown");
  if (elem.style.visibility == "visible") {
    elem.style.visibility = "hidden";
  } else {
    elem.style.visibility = "visible";
  }
}

function toggledropdowndist () {
  elem = document.getElementById ("features-dropdown");
  elem.style.visibility = "hidden";
  elem = document.getElementById ("features-dropdowndist");
  if (elem.style.visibility == "visible") {
    elem.style.visibility = "hidden";
  } else {
    elem.style.visibility = "visible";
  }
}