But only hide those tags that aren't children (or descendants) of other
tags that get replaced anyway. That is needed because sometimes, flash
videos are in <embed> tags, sometimgs in <object> tags and sometimes in
<embed> tags within <object> tags.
Furthermore enforce our "click here" link to have transparent background
(and in future: remove as many properties from website specific CSS
stylesheets).
This means: also replace <object> tags and put the replacement message
even higher in the z-order. (Latter had to be done to make it the
replacement visible on espn _dot_ com)
