I followed recommendations for Mac platform from here: http://java.sun.com/javafx/1/reference/system-requirements-1-2.html
(used JavaFX v 1.2 and JDK 1.5.0_22_147 for MAC)

The sample is attached, also I attached two PNG files one of them (cloud.png) causes exception:

JNLPAppletLauncher: static initializer
Tue Dec 01 11:12:56 PST 2009 JEP creating applet org.jdesktop.applet.util.JNLPAppletLauncher (http://.../)
java.io.UTFDataFormatException: malformed input around byte 15275
  at java.io.DataInputStream.readUTF(DataInputStream.java:612)
  at javax.imageio.stream.ImageInputStreamImpl.readUTF(ImageInputStreamImpl.java:309)
  at com.sun.imageio.plugins.png.PNGImageReader.parse_iTXt_chunk(PNGImageReader.java:443)
  at com.sun.imageio.plugins.png.PNGImageReader.readMetadata(PNGImageReader.java:652)
  at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1314)
  at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1601)
  at com.sun.javafx.tk.desktop.AWTImageLoader.readImageFromStream(Unknown Source)
  at com.sun.javafx.tk.desktop.AWTImageLoader.readImage(Unknown Source)
  at com.sun.javafx.tk.desktop.AWTImageLoader.<init>(Unknown Source)
  at com.sun.javafx.tk.swing.SwingToolkit.loadImage(Unknown Source)
  at javafx.scene.image.Image.initialize(Unknown Source)
  at javafx.scene.image.Image.postInit$(Unknown Source)
  at com.sun.javafx.runtime.FXBase.complete$(Unknown Source)
  at animatedmotion.Main.javafx$run$(Main.fx:50)
  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:592)
  at com.sun.javafx.runtime.adapter.AppletStartupRoutine.run(Unknown Source)
  at com.sun.javafx.tk.swing.SwingToolkit$StartupRoutine.run(Unknown Source)
  at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
  at jep.MySimpleEventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
...