PHP calendar with AJAX

This script is made of three parts: the calendar (basic PHP), two OOP Classes (one for the handling of agenda data, one for the handling of the complex agenda form) and the script for the AJAX-Requests and validation. Design and handling of the dynamic content are separated as it is usefull and loading problems are notified with a warning message. Calendar offers two features: actual day and day matching agenda entry. The entry form offers task, location, importance, status, date, start time, end time and a textarea for the task details. One of the main parts is the completely dynamic created form - offering several possibilities of manipulation. Among other things you can enable and disable certain input forms as you like, the control over the form content is powerfull: It can also be database driven. In the menu modus for example you have the full control over selected values. In total you have the control over ten form elements.