@Marvin: you have to click on the "Play Exodus Online"-link in the bottom left corner

Oops

.
Well, after I had to manually select javaws to execute the .php file with this is, what I get, when I try to start it:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.javaws.Launcher.executeApplication(Launcher.java:1272)
at com.sun.javaws.Launcher.executeMainClass(Launcher.java:1218)
at com.sun.javaws.Launcher.doLaunchApp(Launcher.java:1065)
at com.sun.javaws.Launcher.run(Launcher.java:105)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
at org.xith3d.render.Canvas3DFactory.create(Canvas3DFactory.java:126)
at org.xith3d.render.Canvas3DFactory.create(Canvas3DFactory.java:147)
at org.xith3d.render.Canvas3DFactory.create(Canvas3DFactory.java:255)
at org.xith3d.render.Canvas3DFactory.create(Canvas3DFactory.java:443)
at org.xith3d.render.Canvas3DFactory.createWindowed(Canvas3DFactory.java:739)
at org.xith3d.render.Canvas3DFactory.createWindowed(Canvas3DFactory.java:851)
at org.xith3d.render.Canvas3DFactory.createWindowed(Canvas3DFactory.java:903)
at org.xith3d.render.Canvas3DFactory.createWindowed(Canvas3DFactory.java:928)
at exodus.game.threeD.worlds.zero.three.Exodus3dWorld.<init>(Exodus3dWorld.java:137)
at exodus.game.threeD.worlds.zero.three.Exodus3dWorld.main(Exodus3dWorld.java:178)
... 9 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.xith3d.render.Canvas3DFactory.create(Canvas3DFactory.java:122)
... 18 more
Caused by: java.lang.UnsatisfiedLinkError: no gluegen-rt in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1030)
at com.sun.gluegen.runtime.NativeLibLoader$1.run(NativeLibLoader.java:68)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.gluegen.runtime.NativeLibLoader.loadGlueGenRT(NativeLibLoader.java:66)
at com.sun.gluegen.runtime.NativeLibrary.ensureNativeLibLoaded(NativeLibrary.java:399)
at com.sun.gluegen.runtime.NativeLibrary.open(NativeLibrary.java:163)
at com.sun.gluegen.runtime.NativeLibrary.open(NativeLibrary.java:129)
at com.sun.opengl.impl.x11.DRIHack.begin(DRIHack.java:109)
at com.sun.opengl.impl.x11.X11GLDrawableFactory.<clinit>(X11GLDrawableFactory.java:99)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at javax.media.opengl.GLDrawableFactory.getFactory(GLDrawableFactory.java:111)
at javax.media.opengl.GLCanvas.<init>(GLCanvas.java:113)
at org.xith3d.render.jsr231.CanvasPeerImplAWT.<init>(CanvasPeerImplAWT.java:129)
... 23 more
Seem like you forgot to include the gluegen natives in your jar.
Marvin