Index: lams_tool_lamc/web/authoring/editQuestionBox.jsp
===================================================================
RCS file: /usr/local/cvsroot/lams_tool_lamc/web/authoring/editQuestionBox.jsp,v
diff -u -r1.16 -r1.17
--- lams_tool_lamc/web/authoring/editQuestionBox.jsp	24 Jul 2013 18:29:14 -0000	1.16
+++ lams_tool_lamc/web/authoring/editQuestionBox.jsp	26 Jul 2013 16:10:44 -0000	1.17
@@ -72,39 +72,32 @@
 				var singleCorrectEntry = 0;
 				var radioCorrect=document.McAuthoringForm.correct;
 
-				if ((radioCorrect == 'null') || (radioCorrect == 'undefined'))
-				{
+				if ((radioCorrect == 'null') || (radioCorrect == 'undefined')) {
 					var msg = "<fmt:message key="candidates.groupSize.warning"/>";
 					alert(msg);
 					return false;				
 				}
 
 				var radioGroupSize=radioCorrect.length;
 				
-				if ((radioGroupSize == 'undefined') || (radioGroupSize < 2))				
-				{
+				if ((radioGroupSize == 'undefined') || (radioGroupSize < 2)) {
 					var msg = "<fmt:message key="candidates.groupSize.warning"/>";
 					alert(msg);
 					return false;				
 				}
 				
 				
-				for(i = 0; i < 51; i++)
-				{
-					if (radioCorrect[i] != null)
-					{
-						if ((typeof(radioCorrect[i]) != 'undefined') && (typeof(radioCorrect[i]) != null))
-						{
-							if (radioCorrect[i].checked) 
-							{
+				for(i = 0; i < 51; i++) {
+					if (radioCorrect[i] != null) {
+						if ((typeof(radioCorrect[i]) != 'undefined') && (typeof(radioCorrect[i]) != null)) {
+							if (radioCorrect[i].checked) {
 								singleCorrectEntry =1;
 							}
 						}
 					}
 				}
 				
-				if (singleCorrectEntry == 0)
-				{
+				if (singleCorrectEntry == 0) {
 					var msg = "<fmt:message key="candidates.none.correct"/>";
 					var msgSetFirst = "<fmt:message key="candidates.setFirst"/>";
 					
@@ -118,6 +111,15 @@
 
 					return false;
 				}
+				
+				//verify selected radiobutton should not be blank
+				var selectedAnswerIndex = $('input[name=correct]:checked').val();
+				if (!$("textarea[name=ca" + selectedAnswerIndex + "]").val()) {
+					var msg = "<fmt:message key="error.correct.answer.blank"/>";
+					alert(msg);
+					return false;
+				}
+				
 				return true;
 			}