To clarify, you're talking about the HTML widget that links to http://subgrid.jp/ep01_11_pn/index.html ?
I don't know much about the Pano/VR solution you are using, but if you know the right hooks you can access the iframe's
parent object, and then you can use the
HYPE global object to get at your document and use the API to change scenes. The code would look like:
This assumes you only have one Hype document in the parent.
Note: This will work in a published export as your iframe is on the same domain as your document. However if you are previewing (or ever change this) then it will fail because a child iframe cannot access a parent on a different domain due to browser security policy. For testing with a preview, you may want to check "Disable Cross-Origin Restrictions" in Safari's Develop menu temporarily to get around this.