In page filtering

I haven't seen any option to filter out pieces of a page (like admuncher).  Is there any way to filter out pieces of a page.

What I am trying to say is that I want to go to siteX.com but it has a javascript or some code inside that has a popup to siteY.com.  I want to to filter to out the line that has the code ad here is this possible with sophos?? ...="" site="">ad here is this possible with sophos??>

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