function calendar(date)
{
//If no parameter is passed use the current date.
if(date == null)
date = new Date();
day = date.getDate();
month = date.getMonth();
year = date.getFullYear();
months = new Array('January',
'February',
'March',
'April',
'May',
'June',
'July',
'August',
'September',
'October',
'November',
'December');
this_month = new Date(year, month, 1);
next_month = new Date(year, month + 1, 1);
//Find out when this month starts and ends.
first_week_day = this_month.getDay();
days_in_this_month = Math.floor((next_month.getTime() - this_month.getTime()) / (1000 * 60 * 60 * 24));
calendar_html = '<table style="background-color:666699; color:ffffff;">';
calendar_html += '<tr><td colspan="7" align="center" style="background-color:9999cc; color:000000;">' +
months[month] + ' ' + year + '</td></tr>';
calendar_html += '<tr>';
//Fill the first week of the month with the appropriate number of blanks.
for(week_day = 0; week_day < first_week_day; week_day++)
{
calendar_html += '<td style="background-color:9999cc; color:000000;"> </td>';
}
week_day = first_week_day;
for(day_counter = 1; day_counter <= days_in_this_month; day_counter++)
{
week_day %= 7;
if(week_day == 0)
calendar_html += '</tr><tr>';
//Do something different for the current day.
if(day == day_counter)
calendar_html += '<td align="center"><b>' + day_counter + '</b></td>';
else
calendar_html += '<td align="center" style="background-color:9999cc; color:000000;"> ' +
day_counter + ' </td>';
week_day++;
}
calendar_html += '</tr>';
calendar_html += '</table>';
//Display the calendar.
document.write(calendar_html);
}