Open external links in a new window using jQuery.

gistfile1.js

// Open external links in new windows
jQuery(document).ready(function($) {
  var re = new RegExp( '^([^/]+:)?//([^/]+\\.)?' + window.location.host.replace(/\./g, '\\.') + '/');
	$('body').on('click', 'a', function(event) {
		if(!re.test(this.href)) {
			window.open(this.href, '_blank');
			return false;
		}
	});
});