I think the applets height and width must be at least at least 1 pixel. Because you set the initial display state of the table cell to none it has no height and width. Your applet height and width are set to be a percentage of the cell. 100% of zero (or possibly null) is <=0 so you are getting the exception. Try setting the applets height and width to some pixel value like 1000px and 300px and see what happens.
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