Here is what I have used for installation.
Install Firefox. (Steps not detailed)
Versions known working 3.6.18 has been used on syetter. 3.6.12 on
zd-syetter
Install Firefox FireBug (Steps not detailed)
Install Selenium IDE, an add-on for Firefox
http://seleniumhq.org/download/
Download selenium-ide-1.1.0.xpi
Drag the file onto FireFox to install it.
Install Selenium Server (formerly Selenium RC Server)
http://seleniumhq.org/download/
Download version 2.3.0
Create directory c:\selenium
Create runselenium.cmd with
java -jar selenium-server-standalone-2.3.0.jar -port 4444
Install Selenesse
Download version 2.3.0
(Use DOWNLOADS button near top of page)
selenesse-wiki-and-jar-20101102.zip
create directory c:\selenesse
Extract .zip file to c:\selenesse
Edit runfitnesse.bat for port 8181
(because something else is on port 8080)
Update Fitness version in Selenesse
http://fitnesse.org/.FrontPage.FitNesseDevelopment.FitNesseRelease20110104.
run cmd
cd selenesse
ren fitnesse.jar to fitnesse.mm.dd.yyyy
copy downloaded/fitnesse.jar c:\selenesse
Run Fitnesse.bat
run cmd.
cd fitnesse
run run<tab>
Run Selenium
run cmd
cd selenium
run run<tab>
browse http:localhost:8181
Edit tests in Selenesse (required by new Fitnesse)
search for #!|script
Change it to -!|script
(Don't know the reason for the change)