Using multiple JDKs

[mwp]

Hi,
I am wondering how to use both 1.4 and 1.5 through textpad. I have got it where it can compile in either, but when I try to run the compiled 1.4 I get:

Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object

I have the parameters set as -version 1.4 $BaseName for Run 1.4 and
-source 1.4 $File for Compile 1.4.

Any thoughts are welcomed.

mark