Ajax Toolkit not working

Dear Sir,
 
I have a one web portal. The web portal name is http://www.constructionmarkets.com/. In which I am used Ajax Control Toolkit that is not working in last 10 days and no errors shown when website running on server. Before 10 days the Ajax control toolkit properly working. i Can't understand what is the problem in my portal.
 
Please do something or give any solution.
 

Thanks & Regards,
Bharat Gupta
Team-ConstructionMarkets