[Wikisource-l] Vertical vs lateral view toggle script: where's the code?

After ResourceLoader implementation, we poor basic js scripts inventors are crying...

Well, I'd like to emulate with a local js script the toolbox button switching lateral vs. vertical layout for proofread edit window. Does any of you know where can I find the needed js code?

I tried too to set, as suggested by www.mediawiki.org/wiki/Extension:Proofread_Page,

var proofreadpage_default_layout='horizontal';

into my vector.js to obtain a default vertical layout with no result. Some users love this layout, I'd like to help them! Where am I wrong?

Alex brollo (it:ws)