var utskrift;
var userName;
var passWord;
var conPassWord;
window.onload = startUp;
function startUp() {
  document.getElementById("btnCheck").onclick = saveUser;
  utskrift = document.getElementById("lstUserName")
}
function saveUser() {
    userName = document.getElementById("txtUserName").value;
    passWord = document.getElementById("txtPassWord").value;
    conPassWord = document.getElementById("txtConPassWord").value;
    if(userName === "" || passWord === "" ||  passWord.length <5 || conPassWord === "" || passWord !== conPassWord) {
        if(userName === "")
            utskrift.innerHTML +="Du mangler brukernavn";
        if(passWord === "")
            utskrift.innerHTML += "Du mangler passord";
        if(passWord.length <5)
            utskrift.innerHTML = "Passordet er ikke langt nok";
        if(conPassWord === "")
            utskrift.innerHTML ="Fyll ut alle feltene";
        if(passWord !== conPassWord)
            utskrift.innerHTML = "Passordene matcher ikke";
    }
    else
        utskrift.innerHTML = "Takk for registrering"
}