[Pas2js] where to copy Pas2js units to get it work from lazarus

[Mgr. Janusz Chmiel]

I have finally get pas2js to partially work from Lazarus 2.0.10 R 63526
Win32.
I have rebuilded Lazarus with pas2jsdsgn.lpk package.
When ever I want to compile webbrowser app, I Am getting error. System unit
not found. Error always appear on The line when uses
some units are presented.
Where to put The necessary unit files?
I can put them to The root folder with The project, but this is not correct
approach. Where to setup The unit location correctly please?