Hudson 1.65
Tomcat 5.0.30
Java 1.5.0_07

If you create a job with a name that contains (a) space(s), the calculation of
the URL for next and previous build is calculated wrongly.

Example:
http://oj-info.emea.cpwr.corp:8080/hudson/job/JDK%20chooser%20plugin/7in/8/

Expected:
http://oj-info.emea.cpwr.corp:8080/hudson/job/JDK%20chooser%20plugin/7/

As you see, the 8 should have been replaced with a 7 (I pressed previous build
in build #8).

The fact that this is caused by the spaces, is an assumption...