(function ($) {

    $.fn.ShowMask = function (options) {

        var defaults = {

            top: 150,

            left: 200

        }

        var options = $.extend(defaults, options);

        $("html").append('<div id="ui-mask"></div><div id="ui-mask-div" style="z-index: 99999;position: fixed;top:' + options.top + 'px;left:' + options.left + 'px;"><img src="Images/ui-loading.gif" alt="" /><span>操作正在进行中，请耐心等待......</span></div>')

        _this_ = $("#ui-mask");

        _this_.height($(document).height())

        _this_.show();

    };

    $.fn.HideMask = function (options) {

        _this_ = $("#ui-mask");

        _this_.remove();

    };

})(jQuery);

#ui-mask

        {

            background-color: #666;

            position: absolute;

            z-index:;

            left:;

            top:;

            display: none;

            width: 100%;

            height: 100%;

            opacity: 0.5;

            filter: alpha(opacity=50);

            -moz-opacity: 0.5;

        }

        #ui-mask-div img

        {

            width: 50px;

            height: 50px;

            float: left;

        }

        #ui-mask-div span

        {

            height: 50px;

            line-height: 50px;

            display: block;

            float: left;

            color: Red;

            font-weight: bold;

            margin-left: 5px;

        }

function btn_save()

{

    $(this).ShowMask();

    $.post('url',null,function(d,s){

        $(this).HideMask();

    });

}