How to solve Microsoft JScript runtime error: 'length' is null or not an object?

Question

Hi all,

I am using the following flat calendar control to populate my textboxes with date.

http://www.dynarch.com/static/jscalendar-1.0/simple-1.html.

I am using the validator controls for the textboxes to which i specified the calendar control. The two textboxes are used to enter the start date and end date. I have used the regex,compare validators for these textboxes.

On selecting the date in the calendar control i am receiving the following error in ie 7 aswell fireox 6+.

Microsoft JScript runtime error: 'length' is null or not an object

How can i solve this prob?can anyone pls help me on this?