This jquery plugin can create keybaord shortcuts to select a checkout/radio inputs in a sequence.
Dead Simple!! Call it inputKeyPress() on the container element that wraps yout checkbox/radio inputs. By default 4 keys a,b,c,d are binded to select 1st, 2nd, 3rd and 4th radio input.
$('#answers').inputKeyPress();
To bind to checkbox inputs:
$('#answers').inputKeyPress({type: 'checkbox'});
To use a different set of keys:
$('#answers').inputKeyPress({keys: [keycode1, keycode2, ... keycoden]});