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