control checkboxes input on basic list

Dear all,

I want to collect user input on a list which is displaying checkboxes. I want to display a pop-up window with some info as soon as any user selects one check box from the basic list and on validation display the message on pop-up.

after user confirmation if user again selects some other check box again a message needs to be displayed

I am not sure of the events fired when the user clicks on the list.

Please help with some example.

I have some user buttons( PF status) also on the same list.