var g_choiceMade = false;

function showChoices() {
    hideElm('choiceLink');
    showElm('choices');
}

function pickChoice(n) {
    if (!g_choiceMade) {
        var rowsElm = document.getElementById('rows');
        var rows = rowsElm.value;

        g_choiceMade = true;
        if (n == 1) {
            showElm('resultCorrect');
            adjustScore(10);
            rows++;
            if (rows == 4) {
                rows = 0;
                adjustScore(20);
            }
            setTimeout('allowContinue()', 1000);
        }
        else {
            rows = 0;
            showElm('resultFalse');
            adjustScore(-10);
            setTimeout('allowContinue()', 2500);
        }

        rowsElm.value = rows;
    }
}

function adjustScore(adjustment) {
    var scoreElm = document.getElementById('score');
    score = scoreElm.value;
    score = Math.floor(score) + Math.floor(adjustment);
    if (score < 0) { score = 0; }
    scoreElm.value = score;

    var displayValueElm = document.getElementById('scoreValue');
    displayValueElm.innerHTML = score;
}

function allowContinue() {
    showElm('continue');
}