Concentating Text in a Text Field

Hi all,

I am creating a form where the user can make multiple selection via checkbox's, and I am trying to have the selections entered into 1 text field.

eg,

checkbox1 = apple

checkbox2 = orange

checkbox3 = pear

if checkbox 1 and 2 are selected I want the text field to read "apple, orange"

if all 3 are selected I want to see "apple, orange, pear" etc.

My form has over 60 checkbox's that could be selected.

Is there a simple way to do this?

Thanks in advance

Pete