Are you sure you want to work with 1.3? When you try to download the last version of 1.3 (namely 1.3.1) from Sun, here:
http://java.sun.com/j2se/1.3/download.html you see this warning:
J2SE 1.3.1 has begun the Sun End of Life (EOL) process. The EOL transition period is from Oct 25, 2004 until the General Availability (GA) of the next Java version, Java SE 6 (code name Mustang). With this notice, customers are strongly encouraged to migrate to the current release, J2SE 5.0.
[ January 24, 2006: Message edited by: Jeff Albrectson ]