Acrobat Forms - javascript to hide/unhide text box if any one of a number of radio buttons is enable

I have a form which I am designing in Acrobat 9 which has a section where there are three questions, each with a pair of radio buttons - one for 'yes' and one for 'no'. They are in the style of a check box (with a tick). I need some help to write some code which will unhide a single field (or multiple fields if I need to use something similar at a later date) if any one of the 'yes' radio buttons is checked. So if all three radio buttons were checked, the field would be hidden but if you then changed your mind and clicked a yes button, the field would be visible.

I am new to this so any help would be greatly appreciated. Many thanks in advance! I hope that i have explained this clearly btw.