python to javascript translator question

[Jeffrey Van Voorst]

What code handles the python to javascript translation voodoo for
situations where the browser code has some of its implementation in a
file named *.browser.py?  As an example, for
library/pyjamas/HTTPrequest.py, there is also a file named
library/pyjamas/HTTPRequest.browser.py that is used by the translator
to implement the HTTPRequest Klass' asyncImpl function (for browsers).

--Jeff