You need to be aware that java  (developed by Sun Microsystems) and
JavaScript (developed by the creators of Netscape) are two completely
different things. If it is really JavaScript (a much less sophisticated
scripting language for use in web browsers) you are interested in, the
tutorials from java.sun.com will be of no help. However, if you want to
learn to program  in Java, which also has web browser capabilities, you
might want to start with a good book on Java. There are several that
are good, including one called _Thinking_in_Java_ by Bruce Eckel in HTML
format which can be downloaded for free at the author's web site at:

http://www.mindview.net/Books/TIJ/