function test()
{
    document.getElementById("demo").style.color = "red";
    document.getElementById("demo").style.backgroundColor = "yellow";
    document.getElementById("demo").innerHTML = "Title!";
}
var nextquestion;
var nbQuestion;
function startQuiz(j)
{
    nextquestion = 1;
    nbQuestion = j;
    document.getElementById("test1").style.display = "block";
    document.getElementById("strt").disabled = "true";
}

function tog(j)
{
    
    var chk = [];
    var test = true
    for (i=0;i<j;i++)
    {
        chk[i] = document.getElementById("tgl"+(i+1)+nextquestion);
        test = test && String(chk[i].checked) == chk[i].getAttribute("attribut");
    }
    
    if (test)
    {
        document.getElementById("answer"+nextquestion).innerHTML = "correct";
        document.getElementById("answer"+nextquestion).style.color = "#00ff00";
    } else
    {
        document.getElementById("answer"+nextquestion).innerHTML = "incorrect";
        document.getElementById("answer"+nextquestion).style.color = "#ff0000";
    }
    document.getElementById("answer"+nextquestion).style.display = "block";
    document.getElementById("tgl1"+nextquestion).disabled = "true";
    document.getElementById("tgl2"+nextquestion).disabled = "true";
    document.getElementById("sub1").disabled = "true";
    nextquestion = nextquestion + 1;
    if (nextquestion<=nbQuestion)
    {
    document.getElementById("test"+nextquestion).style.display = "block";
    }
    
}