Clint Side scripting for DataGrid Controls

Plz Guide me how to do client side validation of the dynamically generated grid elements.

e.g.
Data Grid 1
First row | a check box | text box | other columns
Second row | a check box | text box | other columns
Third row | a check box | text box | other columns
Fourth row | a check box | text box | other columns


This is my screen and the data is displayed with grid.

When I click on the delegate checkbox then and only then the corresponding text box should be editable otherwise not.

Plz guide me how to do it at client side.

As the id of these elements are generated dynamically , how to refer the elements in javascript?