Warning when opening external links

alertexternal.js

(function ($) {

  var root = new RegExp(location.host);

  $( 'a' ).each(function() {
    if( location.hostname === this.hostname || !this.hostname.length ) {
      $(this).addClass('local');
    } else {
      $(this).addClass('external');
    }
  });

  $('a.external').on('click', function(e){

    e.preventDefault();
    var notify = confirm(
      "You are about to leave the website of [COMPANY] and view the content of an external website. " +
      "[COMPANY] cannot be held responsible for the content of external websites.\n\n" +
      "Destination: " + $(this).attr('href')
    );

    if (notify){
      window.location = $(this).attr('href');
    }

  });

})(jQuery);