reading data from javascript onClick

[seriousfun]

I have a button in a page with an onClick(data) command attached to it. I want a perl script to be able to read the data without it going to a url. Is this possible or will I have to recode everything and send it via post.

Thanks in advance...

[ACJavascript]

If the actual javascript page is in a perl script yes.
If not then it has to go to a url.