RE: Corrected URLS for collaboration tutorial

[Curtis Rueden <curtis@xxxxxxxxxxxxx>]

>A nonfatal internal JIT (3.10.107(x)) error 'regvar' has occurred in :
>  'visad/data/DefaultFamily$FormFunction.run ()Z': Interpreting method.
>  Please report this error in detail to
>http://java.sun.com/cgi-bin/bugreport.cgi

This error is a problem with the Symantec JIT compiler for Windows in
JDK 1.2.  Solaris systems do not exhibit this problem, nor do machines
running JDK 1.3 with its Hotspot compiler.  This error is harmless and
will disappear once everyone switches to JDK 1.3.

-Curtis