The generated code work successfully in FF, but fail in Chrome browser.
window.parent.document.getElementById( "frameCont" )
Chrome doesn't allow access to parent document in local mode (yes with http protocol)
"Blocked a frame with origin "null" from accessing a frame with origin "null". Protocols, domains, and ports must match. "
This is a security feature of chrome, and is hard to fix it. I'm planning to create a new webhelp page without frames. Until that, the workaround is run chrome without that control. There is a flag for that: --allow-file-access-from-files.
Try to run "C:\Program Files\Google\Chrome\Application\chrome.exe" --allow-file-access-from-files "thewebhelpdirectory\index.html".
Added warning for that on the documentation