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Calling Java applets methods using DOM and JavaScriptTag(s): Javascript interaction

[IE4 or better]
<OBJECT ID="myApplet" ...>
<PARAM NAME="scriptable" value="true">
<PARAM NAME="mayscript" value="true">

[in your script]
You use the scriptable parameter if you call Java method from Javascript.
You use the mayscript parameter if you call Javascript function from Java.

This Sun's document describes how Java to Javascript communication works when using the Java Plug-in.