embedded youtube video has audio that won't stop

Hi, when I play and exit out of my embedded youtube video the audio keeps going and will replay the same part over and over. How can I stop this?

<object width="700" height="425"><param name="allowfullscreen" value="true" /><param name="allowscriptaccess" value="always" /><iframe width="700" height="425" src="http://www.youtube.com/embed/fiAcuRoQjxw" frameborder="0" allowfullscreen></iframe></object>

The link is: click on the video, let it load, then click the x, and you’ll see what I mean.

Please help…
Thank you.