the javascript is:

							
			$( document ).ready(function() {
				var testimonial_ok=false;
				//Inputs that determine what fields to show
				var rating = $('#live_form input:radio[name=rating]');
				var testimonial=$('#live_form input:radio[name=testimonial]');				
				
				//Wrappers for all fields
				var bad = $('#live_form textarea[name="feedback_bad"]').parent();
				var ok = $('#live_form textarea[name="feedback_ok"]').parent();
				var great = $('#live_form textarea[name="feedback_great"]').parent();
				var testimonial_parent = $('#live_form #div_testimonial');
				var thanks_anyway  = $('#live_form #thanks_anyway');
				var all=bad.add(ok).add(great).add(testimonial_parent).add(thanks_anyway);
				
				rating.change(function(){
					var value=this.value;						
					all.addClass('hidden'); //hide everything and reveal as needed
					
					if (value == 'Bad' || value == 'Fair'){
						bad.removeClass('hidden');								
					}
					else if (value == 'Good' || value == 'Very Good'){
						ok.removeClass('hidden');
					}		
					else if (value == 'Excellent'){
						testimonial_parent.removeClass('hidden');
						if (testimonial_ok == 'yes'){great.removeClass('hidden');}
						else if (testimonial_ok == 'no'){thanks_anyway.removeClass('hidden');}
					}
				});	
		
				
				testimonial.change(function(){
					all.addClass('hidden'); 
					testimonial_parent.removeClass('hidden');
				
					testimonial_ok=this.value;
					
					if (testimonial_ok == 'yes'){
						great.removeClass('hidden');
					}
					else{
						thanks_anyway.removeClass('hidden');
					}
					
				});
		});