title: Placeholder text is returned when using value property of input text box in form
body: <p>I am using webshim to provide the html5 placeholder functionality in my textboxes in IE8.</p>
  
  <p>This works fine when I submit the form - the field is blank if the user has not entered anything.</p>
  
  <p>But when I tried to jazz things up by making an ajax request hooked to an onclick event the following line of code returns the placeholder text instead of an empty string.</p>
  
  <pre><code>document.getElementById('idOfTextBox').value
  </code></pre>
  
  <p>How can I avoid this behavior?</p>