Nas dai, its some kinda automation tool. may be load runner or test patner or some sort of other tool. The way it work is,
 A) record the script
 1) Open the IE browser
 2) go to Sajha.com  
 2) find the specific thread 
 3) open the thread ( that will increase the counter of the thead) 
 4) Close The IE Browser.

B) Play back.
    When you play back; write the script using automation tool and embeed the function within and call the fuction in the main script 
 Like  //  For X= 0; X < 33000; X++ 

That will increase the counter of the thread. and again this needs to be done not in the peak time.

This is illi in USA. However, if you have your outsourced Indain Homies that are Automation engineer in India, you can always ask them for a favor., If you know what i mean..

Dreamloverboy.