Selenium 2.0 and WebDriver - the 五 minute getting started guide

Selenium 2.0 and WebDriver - the 5 minute getting started guide

?
according to the website, http://seleniumhq.org/docs/03_webdriver.html, at first, i cannot make it run, because i didn't get the firefox of right version which's supposed to be english version 4. perhaps english version is mandated. and the necessary jars respectively are selenium-java-2.0b3.jar, guava-r08.jar, httpclient-4.0.2.jar, httpcore-4.0.1.jar, commons-logging-1.1.1.jar, json-20080701.jar, the version of the jar may not necessarily be those. all are contained in the lib.zip file.
?
RemoteWebDriver
You’ll start by using the HtmlUnit Driver.This is a pure Java driver that runs entirely in-memory. Because of this, you won’t see a new browser window open.
?
?
and all the jars are in the download page http://seleniumhq.org/download/, selenium2.0b3.