a second question: may I use the same mod_jk.so I used with tomcat 3.2.3??
The configuration of mod_jk is independent of the Tomcat version. As long as the version of Tomcat that you are using supports mod_jk (really ajp13), you can use mod_jk with it (including any existing configuration).
apj13 is supported by pretty much every version of Tomcat that you can get your hands on.
-chris
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