The alert only comes up in firefox, not IE. The page has a popup onload and onunload. Basicaly when the page loads and when you attempt to close your browser it will ask you if you're sure. I want to supress both of these.
If it is from your domain then the easiest way is to remove the code from the page in the iframe (or change it so it doesn't run if the page loads in an iframe).
If it is from some other domain then cross domain security means there is no way for javaScript in your page to have any effect on it.
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