function setup() {
  if (!("lcred" in sessionStorage)) {
    setstatus("You are not logged in.");
    return;
  }
  var url = "/uinfo/email?key=" + sessionStorage.getItem("lcred");
  var req = new XMLHttpRequest();
  req.onreadystatechange = function () {
    if (req.readyState != 4 || req.status != 200) 
      return;
    var reply = JSON.parse(req.responseText);
    if (!("email" in reply)) {
      setstatus("You are not logged in.");
    }
    else {
      setstatus("You are logged in as " + reply.u + ".");
      document.getElementById("input_email").value = reply["email"];
      //document.getElementById("switch").style.display = "block";
    }
  }
  req.open('GET', url, true);
  req.send();
}

function setstatus(stattext) {
  var statnode = document.createTextNode(stattext);
  var statdiv = document.getElementById("ostat");
  statdiv.replaceChild(statnode, statdiv.firstChild);
}

function postemail() {
  if (!("lcred" in sessionStorage))
    return;
  var posturl = "/uinfo/email?key=" + sessionStorage.getItem("lcred");
  var msg = {"v": document.getElementById("input_email").value};
  var req = new XMLHttpRequest();
  req.open('POST', posturl, true);
  req.send(JSON.stringify(msg));
}

function postpw() {
  if (!("lcred" in sessionStorage))
    return;
  var posturl = "/uinfo/pw?key=" + sessionStorage.getItem("lcred");
  var msg = {"v": document.getElementById("input_pw").value};
  var req = new XMLHttpRequest();
  req.open('POST', posturl, true);
  req.send(JSON.stringify(msg));
}