How to check if popup window is focused in JavaScript?

Hello,

If we have a popup window open and it is not in focus how can we check it? If the popup is not in focus and the user is looking at something else I want to play a "beep" sound using <embed>. However if they are focused on the popup I do not wan to play this "beep" sound.

To explain in further detail I have a Instant Messenger running and if the user does not have the IM focused and they get a new message there is no way in letting them know. So I thought a "beep" sound would be nice. I found a way to simply focus() the window, however don't think many will like that.

Any help would be appreciated.

Thank you
iamnatioAsked:
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samic400Commented:
I know I've written web apps to play sounds if certain conditions appear with:

<bgsound src='mysound.wav' loop='3' />

and it works great.
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iamnatioAuthor Commented:
Thank you very much, just what I was looking for.
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