1. $(function() {     
   
2.       $("input[name='cst']").change(function(){
3.             var ChoiceSelected = $("input[name='cst']").val;
4.              window.alert(ChoiceSelected);             
   
5.             if (ChoiceSelected === 'CourseName')
6.             {
7.                   $('#CourseChoiceName').addClass('show').removeClass('hide');
8.                   $('#CourseChoiceNumber').addClass('hide').removeClass('show');
9.             }
10.             else (ChoiceSelected === 'CourseID')
11.             {
12.                   $('#CourseChoiceNumber').addClass('show').removeClass('hide');
13.                   $('#CourseChoiceName').addClass('hide').removeClass('show');
14.             }
15.       });
16. });

I can get it to change once but not back an forth based on what the user selects.