circling text on a pdf fillable form

I currently have a pdf fillable form that I  need to be able to click on a certain letter to create a circle around that letter using a radio button. I have also created  a refresh button that will clear the form once it has been submitted and it clears everything except the letters that I circle using a radio button. Below is a javascript I found online that kind of achieves what I want to do but I have to manually click on the letter to get the circle to clear. Any assistance would be greatly appreciated.

if (event.target.display == display.visible)

{

event.target.display = display.noPrint;

event.target.borderColor = color.transparent;

resetForm(event.target.name);

}

else

{

event.target.display = display.visible;

resetForm(event.target.name);

event.target.borderColor = color.red;

}

Thanks,

Tim