Change stylesheet of an answer option column in a single grid question

Challenge

In order to highlight an answer option column

As a questionnaire creator

I want to change the style sheet of a specific answer option column in a single grid question

Example

I have a single grid question like below.

I want to change the style of Don't know column.

Code

 1 //change style of a SINGLE grid question's answer option column 
 2 //answerOptionValue: value of the answer option column 
 3 //newColor: the new background color of the column's cells 
 4 quest.changeAnswerOptionColumnStyle = function(answerOptionValue, cssClass) 
 5 { 
 6  //change style of answer option text
 7  $("#grid_answeroption_text_" + answerOptionValue).addClass(cssClass);
 8  
 9  //change style of answer option cells
10  $("input:radio").each(
11 	 function(i)
12 	 {
13 	 	if ($(this).val() == answerOptionValue)
14 			 $(this).parent().addClass(cssClass);
15 	 }
16  )
17 
18 } 
19 quest.onInit = function() 
20 { 
21 
22  var dontKnow_value = 3;
23  
24  this.changeAnswerOptionColumnStyle(dontKnow_value, "another_column_css");
25 
26 }

;