Image flush test

This applet tests the behavior of the Image and MediaTracker classes when the Image.flush() method is used to abort an image download. Try hitting the Flush button while the image is downloading and after the image is downloaded. The Redraw button flushes the image and then induces it to reload. The Checkboxes toggle between using a good image and an image that doesn't exist (which will cause an error condition). The error condition should be flushable by hitting the flush button.