function deactivateAllLinks(divID) {
  var divObject = document.getElementById(divID);
  var divChildNodes = divObject.childNodes;
  var index = 0;
  while(index < divChildNodes.length) {
    if(divChildNodes[index].nodeName == "A") {
      if(divChildNodes[index].href != '') {
        divChildNodes[index].className='';
      }
    }
    else if(divChildNodes[index].nodeName == "DIV") {
      deactivateAllLinks(divChildNodes[index].id);
    }
    index++
  }
}

function setSelectedLink(linkID) {
  deactivateAllLinks('topDiv');
  document.getElementById(linkID).className='active';
}

function toggleMenu(menuID) {
  var menuDiv = document.getElementById(menuID);
  if(menuDiv != null) {
    var currentVisibility = menuDiv.style.visibility;
    if(currentVisibility == "visible") {
      menuDiv.style.visibility = "hidden";
      menuDiv.style.display = "none";
    }
    else {
      menuDiv.style.visibility = "visible";
      menuDiv.style.display = "block";
    }
  }
}