SYMPTOM
After upgrading Strategy from version from 9.4.1 to 10 Hotfix 1 HTML containers with Java script stopped working.
CAUSE
This is a known issue regarding html containers after upgrading from 9.4.1 to 10. All html containers have their properties switched from html containers to iFrames.
ACTION
Issue is fixed in Strategy 10.1 Secure Enterprise Platform.
WORKAROUND
In design mode, go into the properties of the html container and change radio button manually from iFrame to HTML container.