var curMnu = ""

function hideEle(id) {
  var e = document.getElementById(id)
  e.style.display = "none"
}

function showEle(id) {
  var e = document.getElementById(id)
  e.style.display = "block"
}

function showMnu(menuID) {

  if (curMnu) {           
    hideEle(curMnu)       
  }

  curMnu = menuID         

  if (curMnu) {
    showEle(curMnu)       
  }
}