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If your version of .NET for this application supports it, have you tried using the WebBrowser control?
http://msdn.microsoft.com/en-us/library/system.windows.controls.webbrowser.aspx
Update: I found a blog post that has a fix for this, although it doesn't do exactly what you wanted. It uses javascript script injection to disable javascript errors. I have not tested this.
http://www.codewrecks.com/blog/index.php/2010/08/31/disable-javascript-error-in-wpf-webbrowser-control/