Sorry I'm late to respond!
I would recommend using the Spine Web Player to do this. We've been improving it a lot lately, so you'll want to use version 4.0. The player handles loading and rendering the skeleton, so it's a lot less code.
We use the player like you want on our 404 error page:
http://esotericsoftware.com/404
You can see the code for how it's done here:
http://n4te.com/x/2007-UqBf.txt.nowrap
This uses data URIs to embed the skeleton JSON, atlas file, and atlas PNG but you could use regular URLs. The Animate function is like the Ola JavaScript library, it is used to smooth out the mouse movement. This code uses the a variable to adjust the mouse position in a circle, to make it so the vortex is always moving. You can remove this if you want it to look at the mouse like the owl.
If you made a tool, it would be interesting to know how it works. Did you use a game toolkit?
