title: GetElementById without id and name HOW?
body: <p>I need to click the button "Add" in the post new wordpress form, this button is to add tags to the post , the trouble is that button don't have the value and id propertie. Is just like that</p>
  
  <p>the html for the button</p>
  
  <pre><code>input type="button" class="button tagadd" value="Add" tabindex="3"
  </code></pre>
  
  <p>my tries</p>
  
  <pre><code>webBrowser1.Document.GetElementById("button tagadd").InvokeMember("click");
  
  webBrowser1.Document.GetElementById("Add").InvokeMember("click");
  </code></pre>