[support] Ajax is not working in Drupal 7

Dear All, I have Drupal 7 site in which everything was working perfectly. But suddenly I am not able to use Views or upload or any ajax features. I am using Drupal 7.12 with various modules like calendar, font-your-face, Chaos tool suite, etc. Any suggestion to solve this problem ? PS: I have attachment which showing my views. -- Regards Amit Karpe. http://www.amitkarpe.com/ http://news.karpe.net.in/