title: Limit Input text box with Jquery
body: <p>So I need to have an input box in where people only is allowed to enter either the words "Yes" or "No". No other input is allowed. Does anybody out there knows a plugin or any other easy way to that with Jquery? I found a plugin named constraint (<a href="http://plugins.jquery.com/project/constrain" rel="nofollow noreferrer">http://plugins.jquery.com/project/constrain</a>), that can prevent the user from typing certain characters, but that is not enough, as the plugin can only prevent the user from typing numbers in an alphabetic field, for example. Drop down boxes or other components are not an option.</p>
  
  <p>Thank you for your help.</p>