How do you switch between JRE v1.4.x and v1.5.x

Java 2 Runtime Environment, v1.5.0_02-b09 Control Panel doesn't appear to let user switch back to a 1.4.x version. Hoping someone can can me how to do this.
I have an application that uses JRE 1.4.2 and does not allow user into the interface until they switch their configuration to the 1.4.2 version by going to Start > Settings > Control Panel > Java Plug-in, selecting the Advanced tab and choosing the 1.4.2 version from the pull down provided in the Java Runtime Environment Section. This process worked fine if the user had v 1.4.x or lower, but does not work now that users have v1.5.x due to the changes in the Control Panel. Does anyone know the equivalent procedure with the new 1.5.x Control Panel so user can specify 1.4.x? (I did play around with the setting in the Java tab, Java Application Runtime Settings section to no avail.) Thanks.

We have had backwards compatibility problems before and must ensure that the product we deliver works for our user community due to the nature of the product. We have compiled our code with 1.4.2 and test internally with 1.4.2_04. In addition, the product that we deliver is in maintenance mode and is not currently funded for development/updates - just need to let the users who have updated to 1.5.x know how to switch back and forth between 1.4.x and 1.5.x. Currently, I can only tell them to remove 1.5.x, which is not desirable.

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