<div title="Limit this field to be null or not.">
  <span name="limit_description" ifset="true">
    Limitar este campo para que sea nulo o no-nulo:<br></span>
	<select name="value" class="fieldLimitValue"><option value="">Select One</option><option value="1">Nulo</option><option value="0">Not Null</option></select></div>
