PHP inserting into parent window text area from child window radio button

[Palastia]

Hmm I see. Well once again thank you for all your help Adam! You've been really helpful! 

[Palastia]

On a slight drift, can the same thing be done with checkboxes rather than radiobuttons? How should I change the sendToParent() function?

[Palastia]

Ugh I am also now facing the problem where the javascript is not working on any other browser other than Firefox.  :'( Not exactly sure what the problem is.

[Palastia]

Edit: I think I know what the problem is. What I need to do is upon inserting the value into ckeditor text area, I need to refresh or reload that same text area but with the earlier inserted data. This is because of a plugin for ckeditor I am using; it turns the inserted mathml into an image but only upon reload. But I do not know how to do this. I would appreciate it if anyone could help me out on this. Thanks.