TOPIC:

function ff_radio1_action(element, action)
{
    switch (action) {
        case 'click':
           vals = '';
opts =  JQuery("[name=\"ff_nm_radio1[]\"]");
for (o = 0; o < opts.length; o++)
 if (opts[o].checked) {
  
   vals = opts[o].value;
 }
          vals1 = '';
opts =  JQuery("[name=\"ff_nm_radio2[]\"]");
for (o = 0; o < opts.length; o++)
 if (opts[o].checked) {
  
   vals1 = opts[o].value;
 }

ff_getElementByName('amount').value=Number(vals)+Number(vals1);

            break;
        default:;
    } // switch
} // ff_radio1_action