Why won't PopUp Pro work with Wufoo Javascript?

I'm having problems getting a Wufoo form to display in a PopUp via javascript. There are problems when saving the PopUp: spinning wheel is continuous, javascript clears after saving, etc.

I've tried making the javascript a shortcode and then adding it to a PopUp, didn't work. The Wufoo form will display if I embed using iframe though.

IS this a javascript issue?