jQuery event on change()

Question

I have a simple form:

Answer 1

Here's another solution (IMO having an id on an seems a bit wrong to me):

$("input[name='color']").change(function () {
        if ($(this).val() == 1) {
            $('.block-cms').show()
            } 
        else {
            $('.block-cms').hide();
        }
    });