(function ($) {
    $.alerts = {
        verticalOffset: -75,
        horizontalOffset: 0,
        repositionOnResize: true,
        overlayOpacity: .8,
        overlayColor: '#000',
        draggable: true,
        okButton: ' OK ',
        cancelButton: ' Cancel ',
        dialogClass: null,
        alert: function (message, title, callback) {
            if (title == null) title = 'Alert';
            $.alerts._show(title, message, null, 'alert', function (result) {
                if (callback) callback(result);
            });
        },
        confirm: function (message, title, callback) {
            if (title == null) title = 'Confirm';
            $.alerts._show(title, message, null, 'confirm', function (result) {
                if (callback) callback(result);
            });
        },
        prompt: function (message, value, title, callback) {
            if (title == null) title = 'Prompt';
            $.alerts._show(title, message, value, 'prompt', function (result) {
                if (callback) callback(result);
            });
        },
        _show: function (title, msg, value, type, callback) {
            $.alerts._hide();
            $.alerts._overlay('show');
            $("BODY").append('<div id="popup_container">' + '<h1 id="popup_title"></h1>' + '<div id="popup_content">' + '<div id="popup_message"></div>' + '</div>' + '</div>');
            if ($.alerts.dialogClass) $("#popup_container").addClass($.alerts.dialogClass);
            var pos = ($.browser.msie && parseInt($.browser.version) <= 6) ? 'absolute' : 'fixed';
            $("#popup_container").css({
                position: pos,
                zIndex: 99999,
                padding: 0,
                margin: 0
            });
            $("#popup_title").text(title);
            $("#popup_content").addClass(type);
            $("#popup_message").text(msg);
            $("#popup_message").html($("#popup_message").text().replace(/\n/g, '<br />'));
            $("#popup_container").css({
                minWidth: $("#popup_container").outerWidth(),
                maxWidth: $("#popup_container").outerWidth()
            });
            $.alerts._reposition();
            $.alerts._maintainPosition(true);
            switch (type) {
            case 'alert':
                $("#popup_message").after('<div id="popup_panel"><input type="button" value="' + $.alerts.okButton + '" id="popup_ok" /></div>');
                $("#popup_ok").click(function () {
                    $.alerts._hide();
                    callback(true);
                });
                $("#popup_ok").focus().keypress(function (e) {
                    if (e.keyCode == 13 || e.keyCode == 27) $("#popup_ok").trigger('click');
                });
                break;
            case 'confirm':
                $("#popup_message").after('<div id="popup_panel"><input type="button" value="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" value="' + $.alerts.cancelButton + '" id="popup_cancel" /></div>');
                $("#popup_ok").click(function () {
                    $.alerts._hide();
                    if (callback) callback(true);
                });
                $("#popup_cancel").click(function () {
                    $.alerts._hide();
                    if (callback) callback(false);
                });
                $("#popup_ok").focus();
                $("#popup_ok, #popup_cancel").keypress(function (e) {
                    if (e.keyCode == 13) $("#popup_ok").trigger('click');
                    if (e.keyCode == 27) $("#popup_cancel").trigger('click');
                });
                break;
            case 'prompt':
                $("#popup_message").append('<br /><input type="text" size="30" id="popup_prompt" />').after('<div id="popup_panel"><input type="button" value="' + $.alerts.okButton + '" id="popup_ok" /> <input type="button" value="' + $.alerts.cancelButton + '" id="popup_cancel" /></div>');
                $("#popup_prompt").width($("#popup_message").width());
                $("#popup_ok").click(function () {
                    var val = $("#popup_prompt").val();
                    $.alerts._hide();
                    if (callback) callback(val);
                });
                $("#popup_cancel").click(function () {
                    $.alerts._hide();
                    if (callback) callback(null);
                });
                $("#popup_prompt, #popup_ok, #popup_cancel").keypress(function (e) {
                    if (e.keyCode == 13) $("#popup_ok").trigger('click');
                    if (e.keyCode == 27) $("#popup_cancel").trigger('click');
                });
                if (value) $("#popup_prompt").val(value);
                $("#popup_prompt").focus().select();
                break;
            }
            if ($.alerts.draggable) {
                try {
                    $("#popup_container").draggable({
                        handle: $("#popup_title")
                    });
                    $("#popup_title").css({
                        cursor: 'move'
                    });
                } catch (e) {}
            }
        },
        _hide: function () {
            $("#popup_container").remove();
            $.alerts._overlay('hide');
            $.alerts._maintainPosition(false);
        },
        _overlay: function (status) {
            switch (status) {
            case 'show':
                $.alerts._overlay('hide');
                $("BODY").append('<div id="popup_overlay"></div>');
                $("#popup_overlay").css({
                    position: 'absolute',
                    zIndex: 99998,
                    top: '0px',
                    left: '0px',
                    width: '100%',
                    height: $(document).height(),
                    background: $.alerts.overlayColor,
                    opacity: $.alerts.overlayOpacity
                });
                break;
            case 'hide':
                $("#popup_overlay").remove();
                break;
            }
        },
        _reposition: function () {
            var top = (($(window).height() / 2) - ($("#popup_container").outerHeight() / 2)) + $.alerts.verticalOffset;
            var left = (($(window).width() / 2) - ($("#popup_container").outerWidth() / 2)) + $.alerts.horizontalOffset;
            if (top < 0) top = 0;
            if (left < 0) left = 0;
            if ($.browser.msie && parseInt($.browser.version) <= 6) top = top + $(window).scrollTop();
            $("#popup_container").css({
                top: top + 'px',
                left: left + 'px'
            });
            $("#popup_overlay").height($(document).height());
        },
        _maintainPosition: function (status) {
            if ($.alerts.repositionOnResize) {
                switch (status) {
                case true:
                    $(window).bind('resize', $.alerts._reposition);
                    break;
                case false:
                    $(window).unbind('resize', $.alerts._reposition);
                    break;
                }
            }
        }
    }
    jAlert = function (message, title, callback) {
        $.alerts.alert(message, title, callback);
    }
    jConfirm = function (message, title, callback) {
        $.alerts.confirm(message, title, callback);
    };
    jPrompt = function (message, value, title, callback) {
        $.alerts.prompt(message, value, title, callback);
    };
})(jQuery);