anchor.diff:          },
           fireSelection: function(caseId,source) {
               if (caseId == this.caseId) return;
  +            $('#submit-patient-btn').attr("disabled", caseId==null);
  +
               this.caseId = caseId;
               for (var listener in this.funcs) {
                   if (listener==source) continue;
  
positive.code:         });
          caseSelect.change(function(e) {
              var caseId = $('#case-select  option:selected').attr('value');
              csObs.fireSelection(caseId,'case-select')
          });
      }
      
  
negative.code:                 <div>
                      <form name="input" action="patient.do" method="get">
                          <select id="case-select" name="<%=PatientView.PATIENT_ID%>"><option id="null_case_select"></option></select>
                          <input type="submit" id="submit-patient-btn" value="More About This Case" />
                      </form>
                  </div>
                  <legend style="color:blue;font-weight:bold;">Mutation Count VS. Copy Number Alteration</legend>
  