calender += '<div class="ui-datepicker-header ui-widget-header ui-helper-clearfix' + cornerClass + '">' +
                        (/all|left/.test(cornerClass) && row == 0 ? (isRTL ? next : prev) : '') +
                        (/all|right/.test(cornerClass) && row == 0 ? (isRTL ? prev : next) : '') +
                        this._generateMonthYearHeader(inst, drawMonth, drawYear, minDate, maxDate,
                            row > 0 || col > 0, monthNames, monthNamesShort) + // draw month headers