A simple jQuery Calendar Widget Plugin with a month view. You can specify which month you would like to display or have it display the current month. With just 100 lines of Javascript code, this plugin is light-weight and perfect for its purpose.
Please enable Javascript to view this calendar.
$("#calendar").calendarWidget({
month: 5,
year: 2009
});
<div id="calendar">
<p>Please enable Javascript to view this calendar.</p>
</div>