Returns all links that are not on the same domain as the website is.

external.js

/* Returns all links that are not on the same domain as the website is.
 *
 * $$('a:external') - Automatically checks for the domain name
 * $$('a:external(example.com)') - Set a custom, base domain
 *
 * Example:
 * 
 * $$('a:external').each(function(popup) {
 * 	popup.addEvent('click', function(e) {
 * 		e.stop();
 * 		window.open(this.get('href'), '_blank').focus();
 * 	});
 * });
 *
 * Author: Oskar Krawczyk (oskar dot krawczyk dot com after nouincolor)
 */

$extend(Selectors.Pseudo, {
	external: function(domain) {
		domain = $pick(domain, window.location.host.toString());
		return (!$(this).get('href').contains(domain) && !$(this).get('href').contains('#'));
	}
});