Blocking youtube

Before:
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<p>
    <object data="/library/editor/ckextraplugins/movieplayer/StrobeMediaPlayback.swf" height="240" id="movie11032" type="application/x-shockwave-flash" width="320"><param name="movie" value="http://www.youtube.com/v/f8REf-lFYSw" /><param name="FlashVars" value="src=http://www.youtube.com/v/f8REf-lFYSw&amp;showplayer=always&amp;width=320&amp;height=240&amp;showiconplay=true&amp;autoplay=0&amp;plugin_YouTubePlugin=/library/editor/ckextraplugins/movieplayer/YouTubePlugin.swf" /><param name="allowFullScreen" value="true" /></object></p>

After:
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