Is a javascript object accessible in the .rjs file (AJAX) ?

i may be wrong, but i think i read a couple of times that you can do
this in an rjs file:

page << "js_obj.showTabByIndex(3)"

i think you can "feed" any JavaScript code into the page object like
this, and it wll be sent back to the browser.
could be wrong though, give it a try.