//顯示遮罩
$.blockUI({
message: $('#divlogin'),
css:{width:"400px", height:"255px", top: ($(window).height() - 400) /2 + 'px', left: ($(window).width() - 400) /2 + 'px'}
});
//取消遮罩
$("#cancel").click(function() {
$.unblockUI();
});

var lyr1 = ($.browser.msie) ? $('<iframe class="blockUI" style="z-index:'+ z++ +';border:none;margin:0;padding:0;position:absolute;width:100%;height:100%;top:0;left:0" src="javascript:false;"></iframe>')
: $('<div class="blockUI" style="display:none"></div>');

$.blockUI({ message: $("#dialog")});
$("#cancel").click(function() {
$.unblockUI();
$(".blockUI").fadeOut("slow");
});