The table has header row, I have used form api's hidden element.

The table is designed to take input in similar way how form takes.

I want to add rows dynamically. The row's cell are form api's texfield. 

The below link shows the functionality I want to do in drupal :-

http://www.switchonthecode.com/tutorials/adding-dynamic-rows-to-flex-datagrid

I have tried using AHAH, but I am not getting the implementation as in the link above.

Please help me.