var type = "away";
function switchChart (tab) {
  document.getElementById("home").style.visibility = "hidden";
  document.getElementById("away").style.visibility = "hidden";
  document.getElementById("aHome").className = "tabOff";
  document.getElementById("aAway").className = "tabOff";
  document.getElementById(tab).style.visibility = "visible";
  if(tab == "home") {
    document.getElementById("aHome").className = "tabOn";
  }
  else if(tab == "away") {
    document.getElementById("aAway").className = "tabOn";
  }
}