If you have an ASP.NET page (.aspx) opened with the JavaScript showModalDialog() function and inside that page there is a form doing PostBack, when the PostBack is being done the page loads in another (popup) window. The easiest way to prevent this is to add the following tag inside the <HEAD></HEAD> tags of the ASP.NET page:
From: http://www.geekpedia.com/Question23_Using-showModalDialog()-with-an-ASP.NET-page-that-does-PostBack-opens-another-window.html
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