call javascript from applet which is loaded in one frame

Hello,
I hava a problem like below:
page a.jsp has 3 frames: a1.jsp, a2.jsp, a3.jsp
In a3.jsp, I have an applet with one button. When user click on button, it will do a javascript function. I use getAppletContext().showDocument(url).... This function works when a3.jsp is not in frame, but in case a3.jsp is one of frame of a.jsp, this function doesn't work.
Please tell me how to fix it
Thank you very much
nphnhiAsked:
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lcwidingCommented:
I would recommend using:

getAppletContext().showDocument(url, "_self");

If this does not work, what is displayed in the java console?
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