<input type="text" id="txtCaptcha" class="txtcaptcha" disabled="" style="background-image:url(images/1.jpg);text-align:center; border:none;
            font-weight:bold; font-family:Modern">

WebBrowser1.Navigate(http://silverzone.org/newweb/ITHO17Result.html)
txt1.Text = WebBrowser1.Document.getElementById("txtCaptcha").InnerText