function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        };
    }
}

function disableButtonOnLoading(buttonId, loadingPlace) {
    $('#' + buttonId).css('display', 'none');
    $('#' + loadingPlace).html("<img src='/App_Themes/Portal/images/fb_loader_small.gif' alt='' width='16' height='11' /> Processing...");
    $('#' + loadingPlace).show();
}

function CheckNumber(id) {
    var txtQuantity = document.getElementById(id);
    if (isNaN(txtQuantity.value)) {
        alert('Bạn phải nhập số');
        txtQuantity.value = "";
        return false;
    }
    return true;
}

function pressEnterKey(e, buttonid) {
    var evt = e ? e : window.event;
    var bt = document.getElementById(buttonid);
    if (bt) {
        if (evt.keyCode == 13) {
            bt.click();
            return false;
        }
    }
    return true;
}

function showMessage(message, url) {
    alert(message);
    if (url) window.location = url;
}

function RedirectMethod(url) {
    window.location = url;
}