jqueryUI弹出框问题

dialog = function(Window,dialogDivId,title,buttons,css) {
            css = css||{};
            var width = css.width||"500px";
            _this = this
            subWindow.$("#" + dialogDivId).wijdialog({
                autoOpen : true,
                height : "auto",
                width : width,
                title: title,
                modal : true,
                position: "top",
                draggable : true,
                buttons : buttons,
                open : function(event, ui) {
                    $(‘body‘).css(‘overflow‘, ‘hidden‘);
                    $(‘.ui-widget-overlay‘).css(‘height‘, $(document).height());
                    $(" .mainContent").css(‘z-index‘,‘1500‘);
                    _this.isBlock = true;
                    _this.block(false);
                },
                close : function(event, ui) {
                    $(‘body‘).css(‘overflow‘, ‘auto‘);
                    $("#" + dialogDivId).wijdialog("close");
                    $("#" + dialogDivId).wijdialog("destroy");
                    $(" .mainContent").css(‘z-index‘,‘‘);
                    $("#" + dialogDivId).remove();
                    _this.isBlock = false;
                    _this.unblock();
                },
                captionButtons : {
                    pin : {
                        visible : false
                    },
                    refresh : {
                        visible : false
                    },
                    toggle : {
                        visible : false
                    },
                    minimize : {
                        visible : false
                    },
                    maximize : {
                        visible : false
                    }
                }
            });
            $("#" + dialogDivId).wijdialog(‘open‘);
            $("#" + dialogDivId).css("z-index", 10000);
        }