var p4 = p4 || {};

(function (p4) {

    function create_dialog() {
        if ($('#p4_alerts').length === 0) {
            $('body').append('<div id="p4_alerts"></div>');
        }
        return $('#p4_alerts');
    }

    function alert(title, message, callback) {
        var dialog = create_dialog();

        var button = new Object();

        button['Ok'] = function () {
            if (typeof callback === 'function')
                callback();
            else
                dialog.dialog('close');
        };
        if (dialog.data('ui-dialog')) {
            dialog.dialog('destroy');
        }

        dialog.attr('title', title)
            .empty()
            .append(message)
            .dialog({
                autoOpen: false,
                closeOnEscape: true,
                resizable: false,
                draggable: false,
                modal: true,
                buttons: button,
                overlay: {
                    backgroundColor: '#000',
                    opacity: 0.7
                }
            }).dialog('open');

        if (typeof callback === 'function') {
            dialog.bind("dialogclose", function (event, ui) {
                callback();
            });
        }
        else {

        }

        return;
    }

    p4.Alerts = alert;


    return;
}(p4));