Using two versions of jre simultaneously

We have two web java-based applications, and each one requires one specific version of java (1.4.1_03 and 1.3.1_07).
They only work with their required java version. Furthermore, if we install the newer one, the one which needs the oldest does not work.
Is there any way to install both versions, and use them each one with its associated application (i.e. changing path..)?
The management operations for both applications will be carried out from a single point (a single PC, Windows NT/2000), and we need to have access to both applications from that single point.
Any help is welcome.....
Thank you

I maintain a plethora of Java versions on my PC, I use a script to switch among them; it sets the PATH accordingly.
1.1
1.1.8
1.1.8_v3
1.2.2
1.3.1
1.3.1_08
1.3.1_09
1.4.1
1.4.1_01_blackdown
1.4.1_02
1.4.1_05
1.4.2
ijbalazs@bijpc:~> . j 1.1
java version "1.1.8"
ijbalazs@bijpc:~> . j 1.2.2
java version "1.2.2"
Classic VM (build JDK-1.2.2_014, green threads, nojit)
ijbalazs@bijpc:~> . j 1.3.1
java version "1.3.1_09"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_09-b03)
Java HotSpot(TM) Client VM (build 1.3.1_09-b03, mixed mode)
ijbalazs@bijpc:~> . j 1.4.1
java version "1.4.1_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_05-b01)
Java HotSpot(TM) Client VM (build 1.4.1_05-b01, mixed mode)
ijbalazs@bijpc:~> . j 1.4.2
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
ijbalazs@bijpc:~>

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departments still have 1.3.1 as standard since
business applications must use this version. We've
tried migrating to 1.4.2 and 1.5.0 but they were not
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Using two versions of jre simultaneously

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