Hi,
The most reliable way for you to do auto login is to capture the authentication cookies and then attach the cookie through BeforeRequestLoad event. However it is also possible for you to do it with EvalScript. In order to do it with EvalScript, your image element usually needs to have an id, the code will be something like this:
Code: C#
WebView1.EvalScript("document.getElementById('your_image_button_id').click();");
This will have the same effect as user clicking on the image at position (0, 0) thus submitting the form.
Thanks!