Refer to the following description in PTViewer documentation.
i'name' - name of image to be displayed when hotspot is activated. Must be gif or jpeg, and will be shown centered at hotspot location. Instead of an image, any of the ptviewer commands can be specified. This command will be executed when the mouse enters the hotspot region. Example: <PARAM name=hotspot6 value=" x776 y124 n'Lamp' i'ptviewer:PlaySound(0)' u'Controls.html' "> For more information, refer to http://www.fh-furtwangen.de/~dersch/PTVJ/doc.html
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