[plt-scheme] switching between MzScheme versions

Hi,
I frequently download the most recent version of the SVN repository trunk. 
In some cases it would be nice to switch quickly from one version to another 
one, particularly in case a newer version makes my programs produce other 
results. However, it is clearly adviced not to install more than one version 
of MzScheme at the same time. Therefore I have to uninstall and install 
frequently, but this is a time consuming operation. Is there a method that 
allows me to quickly switch between versions? (on windows XP)
Thanks, Jos Koot.
((((lambda(x)((((((x x)x)x)x)x)x))
   (lambda(x)(lambda(y)(x(x y)))))
  (lambda(x)(write x)x))
 "greetings, Jos")