Eclipse Installed JREs

[Sondra Colagrossi]

I have two JRE's on my machine. I am trying to build stuff for Websphere 5 so I need the 1.3 edition. Eclipse detected my 1.4 JRE. I found under preferences where I could tell it I had a 1.3 JRE too. Now the 1.4 JRE has the check mark next to it. As it states in the dialog box this will be the default JRE used to build and run java programs.
Is there a way to set which jre is used on a project by project basis? I selected my project, pulled up properties but I don't see anything there.
Or do I have to toggle this back and forth manually when I change from a 1.3 to a 1.4 environment?
TIA

[Ilja Preuss]

In 3.0M3, you can change the compiler settings per project. Don't know about the JRE, though you could try to manually replace the rt.jar file in the Java Build Path/Libs list.