<input id="agree_cbox" class="input_check" type="checkbox" value="1" name="agree_to_terms"/>

Webbrowser1.Document.GetElementById("").Focus
Sendkeys.Send(" ")
Dim HElement As HtmlElement
HElement = WebBrowser1.Document.GetElementById("agree_cbox")
HElement.SetAttribute("checked", "true")
Dim HElement As HtmlElement
HElement = WebBrowser1.Document.GetElementById("agree_cbox")
HElement.SetAttribute("checked", "false")
