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 } quest.onInit = function() { 
19 
20  var dontKnow_value = 3;
21  
22  this.changeAnswerOptionColumnStyle(dontKnow_value, "another_column_css");
23 
24 }

;