JavaScript Quiz1

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css">
        div#test {

            border: solid;
            width: 730px;
            height: 360px;
            padding-left: 83px;
            padding-top: 53px;
            margin: 88px;
        }

        div#test-Result {
            width: 730px;
            height: 36px;
            padding-left: 26px;
            padding-top: 8px;
            margin: 88px;
        }
    </style>
</head>
<body>
    <div id="test-Result"></div>
    <div id="test"></div>
</body>
</html>
<script type="text/javascript">
    var test, testResult, pos = 0, count = 0, op1, op2, op3, answer;
    var Questions = [
        [["20", "10", "5", "5"], "40", "41", "42", "a"],
        [["20", "10", "5", "5", "5"], "50", "45", "42", "b"],
        [["20", "10", "5", "5", "5", "5"], "41", "42", "50", "c"],
        [["20", "10", "5", "5"], "46", "41", "40", "c"],
    ];

//Function to return ID
    function _(element) {
        return (document.getElementById(element));
    }

    function getQuestions() {
       // debugger;
        test = _("test");
        testResult = _("test-Result");
        testResult.innerHTML = "Currently you are Viewing Question " + (pos + 1) + " Out of " + (Questions.length);
        test.innerHTML = "";
        var questionsLength = Questions[pos][0];
        for (var i = 0; i < questionsLength.length; i++) {
            test.innerHTML += questionsLength[i] + '</br>' + '</br>';

        }

        op1 = 'a  ' + '<input  name="choices" type="radio" value="a" />' + '  ' + Questions[pos][1] + '</br>';
        op2 = 'b  ' + '<input  name="choices" type="radio" value="b"/>' + '  ' + Questions[pos][2] + '</br>';
        op3 = 'c  ' + '<input  name="choices" type="radio" value="c"/>' + '  ' + Questions[pos][3] + '</br>';

        test.innerHTML += op1;
        test.innerHTML += op2;
        test.innerHTML += op3;
        test.innerHTML += '<input type="button" value="Submit Answer" id="Submit"  onclick="checkResult()"/>'
    }

    getQuestions();

//Check the selected answer
//Display the question number in header

    function checkResult() {
        //debugger;
        answer = Questions[pos][4];
        var choicesArr = document.getElementsByName('choices');
        for (var i = 0; i < choicesArr.length; i++) {
            if (choicesArr[i].checked) {
                if (choicesArr[i].value == answer) {
                    count = count + 1;
                }
            }
        }
        pos++;
        if (Questions.length > pos) {
            getQuestions();
        }
        else if (Questions.length == pos) {
            testResult.innerHTML = "You have " + count + "  correct Answers Out of " + (Questions.length) + " Questions";
            test.style.visibility = 'hidden';
        }
    }


</script>