function checkNums(){
    var n1 = document.getElementById('n1').options[document.getElementById('n1').selectedIndex].text;
    var n2 = document.getElementById('n2').options[document.getElementById('n2').selectedIndex].text;
    var n3 = document.getElementById('n3').options[document.getElementById('n3').selectedIndex].text;
    var n4 = document.getElementById('n4').options[document.getElementById('n4').selectedIndex].text;
    var n5 = document.getElementById('n5').options[document.getElementById('n5').selectedIndex].text;
    var n6 = document.getElementById('n6').options[document.getElementById('n6').selectedIndex].text;
    if (n1 == n2 || n1 == n3 || n1 == n4 || n1 == n5 || n1 == n6 || n2 == n3 || n2 == n4 || n2 == n5 || n2 == n6 || n3 == n4 || n3 == n5 || n3 == n6 || n4 == n5 || n4 == n6 || n5 == n6) {
        document.getElementById('error').style.display = 'block';
        document.getElementById('submit_button').disabled = true;
    } else {
        document.getElementById('error').style.display = 'none';
        document.getElementById('submit_button').disabled = false;
    }
}


function selectNums(){
    var num = Loto6.get();
    for (i = 1;i <= 6;i++) {
        var opt = document.getElementById('n' + i).options;
        for(j = 0;j <= 36;j++){
            if (opt[j].value == num[i-1]) {
                opt[j].selected = true;
                continue;
            }
        }
    }
    document.getElementById('error').style.display = 'none';
    document.getElementById('submit_button').disabled = false;
}