jQuery event on change()

Question

I have a simple form:

Answer 1

First of all the id on the element should be radio10 and not #radio10.

Then use this code

$("input[name='color']").change(function () {
    if ($('input#radio10').is(':checked') ) {
            $('.block-cms').show()
            }
        else {
            $('.block-cms').hide();
        }
    });