Dynamic check boxes sum in javascript

I have a set of dynamic categories & sub categories of check boxes.Which is look like,

Test1

Test1.1 12 check box Test1.2 13 check box ...

Test2

Test2.1 15 check box Test2.2 16 check box ...

Test n

Testn.1 12 check box ... I want each categories sum like .,

Test1 25 Test2 21 ......... Test n nth answer`

I want this in javascript. Can anyone help me to find a solution?