PHP Help

I'm trying to execute a print function with PHP when a checkbox is checked. But I'm having a hard time figuring out how to configure the checkbox to do what I want. I am also willing to do it with a drop box or what have you.

Anyone know how to do this? or a site that might be able to tell me?

Thanks!

http://images.4chan.org/g/src/1296364499334.png
^Example

I'd prefer if I didn't have to submit it, but if that's necessary then that is okay