What errors are you getting?

From what I remember, in order to get OpenGL stuff to run in Eclipse, you need at the very least to import the jars (so they end up under the Referenced Libraries heading) and run the applet with JOGLAppletLauncher instead of the usual Applet Launcher.  You set this by going to Open Run Dialog, finding your project, and setting the Main->Applet field to com.sun.opengl.util.JOGLAppletLauncher.

If it would help, I have a project that I'm working on that's up at http://code.google.com/p/rgbgame/, and I think you can get the files through anonymous SVN using the command "svn checkout http://rgbgame.googlecode.com/svn/trunk/ rgbgame".  That requires that you have Subversion installed.  I'm pretty sure that it has the Eclipse project included and set up, using OpenGL plus Processing.  Maybe it will at least get you started...in order to run the thing, you still may have to set the run settings as I mentioned above (not sure if this comes along with the project), and you might need to run the build.xml script first to compile everything in the right way.  It does occur to me that it would probably be useful if someone posted a blank Eclipse project that had all of this stuff worked out...anyone have something like this?

I've never used JOAL, though, so I can't offer any advice there.