function loadCalendar(step) {
    year = parseInt($('#calend_year').val(), 10);
    month = parseInt($('#calend_month').val(), 10);
    new_month = month + step;
    if (new_month <= 9) new_month = '0' + new_month;
    new_year = year;
    if (new_month > 12) {
        new_month = '01';
        new_year++;
    }
    if (new_month == 0) {
        new_month = '12';
        new_year--;
    }
    $('#calendarSrch').load('/scripts/calendar.php?month=' + new_month + '&year=' + new_year + '&table=' + $('#calend_table').val());
}