' Hides script errors without hiding other dialog boxes.
Private Sub SuppressScriptErrorsOnly(ByVal browser As WebBrowser)

    ' Ensure that ScriptErrorsSuppressed is set to false.
    browser.ScriptErrorsSuppressed = False

    ' Handle DocumentCompleted to gain access to the Document object.
    AddHandler browser.DocumentCompleted, _
        AddressOf browser_DocumentCompleted

End Sub

Private Sub browser_DocumentCompleted(ByVal sender As Object, _
ByVal e As WebBrowserDocumentCompletedEventArgs)

    AddHandler CType(sender, WebBrowser).Document.Window.Error, _
        AddressOf Window_Error

End Sub

Private Sub Window_Error(ByVal sender As Object, _
    ByVal e As HtmlElementErrorEventArgs)

    ' Ignore the error and suppress the error dialog box. 
    e.Handled = True

End Sub

// Hides script errors without hiding other dialog boxes.
private void SuppressScriptErrorsOnly(WebBrowser browser)
{
    // Ensure that ScriptErrorsSuppressed is set to false.
    browser.ScriptErrorsSuppressed = false;

    // Handle DocumentCompleted to gain access to the Document object.
    browser.DocumentCompleted +=
        new WebBrowserDocumentCompletedEventHandler(
            browser_DocumentCompleted);
}

private void browser_DocumentCompleted(object sender, 
    WebBrowserDocumentCompletedEventArgs e)
{
    ((WebBrowser)sender).Document.Window.Error += 
        new HtmlElementErrorEventHandler(Window_Error);
}

private void Window_Error(object sender, 
    HtmlElementErrorEventArgs e)
{
    // Ignore the error and suppress the error dialog box. 
    e.Handled = true;
}