function fireClickEventOnEnter(textbox, button) {
    $(textbox).keypress(function(event) {
        if (event.keyCode == '13') {
            event.preventDefault();
            $(button).click();
        }
    });
}

function setCookie(c_name, value, expiredays) {
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toUTCString());
}
function getCookie(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return "";
}

function NIPIsValid(nip) {
    var weights = [6, 5, 7, 2, 3, 4, 5, 6, 7];
    nip = nip.replace(/[\s-]/g, '');

    if (nip.length == 10 && parseInt(nip, 10) > 0) {
        var sum = 0;
        for (var i = 0; i < 9; i++) {
            sum += nip[i] * weights[i];
        }
        return (sum % 11) == nip[9];
    }
    return false;
}

function validateNIP(sender, args) {
    args.IsValid = NIPIsValid(args.Value);
}