Is this the page ?
That appears to be the page and I get an alert - since the web shield has Abort Connection - but my first choice for the Web Shield is Ask, so I can try to gather some information - I got somewhere in the region of 6 alerts after selecting Abort Connection, it kept popping up again and again.
When the alerts stopped I see a huge chunk of Script I don't know if that is what avast is complaining of. But there are lots of other scripts heading off to 3rd party sites and that too could be what avast is excited about.