Submitting a form navigated to using WebBrowser control

I am doing the old screen scraping technique to automate the manual retrieval of data some of our people do daily. I have the logon and password being entered in the the textboxes on the screen - but the submit button is an image which has no name or id property. I don't see any way I can click that button for them.  Is there a way to submit that form without clicking the image?  
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CreditSoupTechAuthor Commented:
Found the answer myself.  The form had no name specified so I had to loop through all the elements till I found FORM.  Luckily the other two forms on this page did have names.  

 HtmlDocument doc = webBrowser1.Document;
                elems = doc.All.GetElementsByName("");

                if (elems != null && elems.Count > 0)
                    for (int i = 0; i < elems.Count; i++)

                            elem = elems[i];
                            if (elem.TagName.Equals("FORM"))

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