function nextmonth() {
var cmonth= new Number(document.webervations_calendar.month_num.value);
var nmonth=cmonth+1;
if (nmonth == 13) {
	nmonth=1;
	}
document.webervations_calendar.month_num.value = nmonth;
document.calendar.src='http://www2.webervations.com/calendars/calendar_8003_avail'+nmonth+'.gif';
}

function lastmonth() {
cmonth=Number(document.webervations_calendar.month_num.value);
nmonth=cmonth-1;
if (nmonth == 0) {
	nmonth=12;
	}
document.webervations_calendar.month_num.value = nmonth;
document.calendar.src='http://www2.webervations.com/calendars/calendar_8003_avail'+nmonth+'.gif';
}