function Loading(Loadingstr) {
	if (typeof(Loadingstr) == "undefined") Loadingstr = "数据处理中，请稍候...";
    if (!$("#LoadingDiv")[0]) {
        var LObj = document.createElement("div"); //创建一个div对象（背景层）   
        LObj.setAttribute('id', 'LoadingDiv');
        LObj.style.zIndex = "30001";
        document.body.appendChild(LObj); //在body内添加该div对象
    } else {
        if ($("#LoadingDiv").css("display") == "none") {
            $("#LoadingDiv").css({"display":"block","z-index":"10001"});
        }
    }
    $("#LoadingDiv").html("&nbsp;<img src=\"/Images/loading_16x16.gif\" align=\"absmiddle\" />&nbsp;" + Loadingstr);
}

function CloseDiv(obj) {
    if ($("#" + obj)[0]) {
        $("#" + obj).hide();
        document.body.removeChild($Id(obj));
    }
}