// Decimal fraction check
function checkNumber(elementName) {
    var arv = elementName.value;
    if (arv.indexOf(',') != -1) {
        arv = arv.substring(0, arv.indexOf(',')) + '.' + arv.substring(arv.indexOf(',') + 1, arv.length);
        elementName.value = arv;
    }
    var i;
    var hadpoint = 0;
    var ch = '';
    var chprev = '';
    for (i = 0; i < arv.length; i++) {
        ch = arv.substring(i, i + 1);
        if (((ch < '0' || ch > '9') && ch != '.' && ch != '-') || (ch == '-' && (i > 0 || arv.length <= 1)) || (ch == '.' && (chprev == '-' || i == 0 || i == arv.length - 1))) {
            window.alert('Arv sisestatud ebakorrektselt!');
            elementName.value = "";
            elementName.select();
            break;
        } else {
            if (hadpoint == 1 && ch == '.') {
                window.alert('Arv sisestatud ebakorrektselt!');
                elementName.value = "";
                elementName.select();
                break;
            } else {
                if (ch == '.') {
                    hadpoint = 1;
                }
            }
        }
        chprev = ch;
    }
}

// Integer check
function checkInteger(elementName) {
    var arv = elementName.value;
    var i;
    var ch = '';
    for (i = 0; i < arv.length; i++) {
        ch = arv.substring(i, i + 1);
        if (ch < '0' || ch > '9') {
            window.alert('Arv sisestatud ebakorrektselt!');
            elementName.value = "";
            elementName.select();
            break;
        }
    }
}