Why do Java web applets show up in the Dock sometimes?

I use web-based gradebook (Infinite Campus). At times since upgrading to Lion, when I load this Java applet through Safari and begin to interact with it, it pops up as a Dock icon. This never used to happen under Snow Leopard. I can't tell if it's something different with the applet or with Lion/Safari 5.1, but I'm assuming the latter. Can anyone shed any light on this? Why would a Java applet show up in the Dock as its own icon while runnign within Safari rather than just running "faceless" within the Safari window? Is there any way to change this behavior on my end? I've poked around in the /Applications/Utilities/Java Preferences app, but I haven't found anything relevant. I've tried re-installing the Lion Java runtime, 10.7.2 Combo Updater, and Safari 5.11, to no effect.

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