JavaScript: calling Java system code message...

When I try and call an applet function from Javascript, I get the following message in the output window:
JavaScript: calling Java system code
JavaScript: default security policy = file://
... and the method isn't called.
Can someone tell me what I need to do please?

Research pointers:
http://devedge.netscape.com/library/manuals/2000/javascript/1.5/guide/lc.html#1014290
http://java.sun.com/j2se/1.4.1/docs/guide/plugin/developer_guide/js_java.html

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