Javascript is a client-side language (whose real name, by the
way, is nowadays ECMA script), and should not be confused with
Java. You can write Javascript inside your RXML pages, and Roxen
will handle it like other web servers: i.e. ignore it, and passing
it on as ordinary text to the browser. In other words, it has
essentially nothing with the web server to do, and is exclusively
a matter between the page author and the page visitor's browser.
Keep in mind, however, that it will pass through an XML parsing
stage just as any other text in an RXML page, so symbols that have
special meaning in XML, such as < and & may
have to be quoted to reach the browser unscathed.
Consult a book on Javascript/ECMA-script for more information
about how to use that language, e.g "JavaScript, The Definitive Guide,
4 th ed." by David Flanagan (2001).