ajax calendar

I am after an AJAX calendar or Date Picker. The AJAX calendar has start date and end eg (1/1/2009, 31/12/2010). When user selects a date, it queries the database for content, and display the information in a div below the calendar. The user must be able to navigate from month to month. Some dates on the calendar can be selected, others cannnot. eg.. When the calendar is created, it queries the database for dates which have content, the dates which have content is link, the dates which do not have content is not a link. There will be many dates, so maybe each must be created, when user navigates?