Automatically open external link to new window using target="_blank"

External Links Target Blank.js

// extend jquery by external links selector
jQuery.extend( jQuery.expr[':'], {
    external: function(obj) {
        return !obj.href.match(/^mailto\:/) && (obj.hostname != location.hostname) && !obj.href.match(/^javascript\:/) && !obj.href.match(/^$/);
    }
});

jQuery(document).ready(function() {
    // automatically open external links to new window
    jQuery('a:external').attr('target', '_blank');
});