Help with PDF JavaScript

Hi community, 

      I would like some help with some javascript ! The script I found helps me with marking circles over answers on a pdf that I have. However, I would like some help changing the code so that if I click on the button again, the circle disappears--to give people the option of selecting and deselecting. Any help much appreciated. 

The code is below. Credit Source: http://khkonsulting.com/2016/11/mark-selected-options-with-circles-in-pdf-forms/#:~:text=On%20the%20%E2%80%9COptions%E2%80%9D%20tab%20select,select%20options%20on%20the%20form.

var baseName; var currentState;

// get our name

var theName = event.target.name;

var re = /(.*)\.(.*)/; var ar = re.exec(theName);

if (ar.length > 0) {

    baseName = ar[1];

    currentState = ar[2];

    // make this button visible

     event.target.buttonSetIcon(this.getField("icon").buttonGetIcon());

     event.target.buttonPosition = position.iconOnly;

     // hide the other button var f_parent = this.getField(baseName);

     var f = f_parent.getArray();

     for (var i in f) {

          if (f[i].name != theName) {

               f[i].buttonPosition = position.textOnly;

           }

         }

       }

       this.calculateNow();