prevent this page from creating additional dialogs

You can't disable it.
This is a browser feature and is intended to protect the user, If you could turn it off, all those sites spamming users with dialogs would have a way to stop it.

So in short, no.

Make your application work with it instead of against it, don't rely on dialogs/confirmations to much. rather have a modal-box ask questions, it is pretty too :) - stackverflow[^]

-KR