title: Disable dynamically a jquery plugin
body: <p>I use the <a href="http://www.texotela.co.uk/code/jquery/numeric" rel="nofollow noreferrer">jquery numeric plugin</a> to allow only numbers to be typed in some fields.</p>
  
  <pre><code>$("input.numeric").numeric();
  </code></pre>
  
  <p>I want to disable this function dynamically in some cases, to allow the user to type others characters (i.e. letters).
  I tryed to use the unbind() or undelegate() functions without success.</p>
  
  <p>Does anyone know the solution ?
  Thanks</p>