easyui关闭tab自动切换到前一个tab

var lastTabs = new Array();

$(function() {
           

            /*
            * cdh 2010.0630 补充，用于 退回上次标签页
            */
            $('#mainTabs').tabs({
                onSelect: function(tt) {
                    //移除 tt
                    lastTabs = $.grep(lastTabs, function(n, i) { return n != tt; });
                    //重新压入，保证 最新的在最上面
                    lastTabs.push(tt);
                    //更新当前           
                    currentTabTitle = tt;
                },
                onClose: function(tt) {
                    //移除 tt
                    lastTabs = $.grep(lastTabs, function(n, i) { return n != tt; });
                    //重新选择
                    $('#mainTabs').tabs('select', lastTabs[lastTabs.length - 1]);
                }
            });
        });