title: Login with several options, show/hide other fields
body: <p>My page will contain 2 login alternatives.</p>
  
  <p>Alt. 1 : Fields for database name, username and password.
  Alt 2: Field for the database connectionstring.</p>
  
  <p>When you start typing in a field in alternative 1, i want the connectionstring field to hide and opposite... if you start typing in the connectionstring field i want the other 3 fields to hide.</p>
  
  <p>Is there a easy way to accomplish this with knockout validation ?</p>
  
  <p>Thanks on forehand!</p>