Easier to just make it in html wmode: transparent with a krpano.call

If you've already made it in flash actionscript its should be very similar. Where are you going wrong?

Is there a reason you don't want to do it in krpano? It's a lot easier and mostly the same. Just a bit more javascripty. It is faster though if you need to make a couple thousand buttons at once.

Try reading the basic krpano documentation first.
a normal krpano button would be
<layer name="button" url="button.png" enabled="true" keep="true" visible="true" onclick="myfunction();" />

in the javascript plugin you're doing the same thing but on a lower level one attribute at a time.

Then just use javascript. Forget about a plugin as that doesn't make sense in your situation.

Look here.
http://krpano.com/docu/js/#top