Getting element parents and children looks pretty easy, but for some reason it’s not working for me. Here’s a guide that puts it nicely.

So I was playing around with phpBB3 RC5, the latest version of the popular phpBB forum software, when I ran into this error. It’s not a PHP error, actually, but a JavaScript one. I’m working on heavily modifying a phpBB install, and in this case I wanted it to submit a new topic automatically.
The form’s [...]