// external.js
// this script changes attribute 'rel="external"' of <a> element to 'target="_blank"'
//
// http://blog.ninedays.org/2008/04/07/change-rel-external-to-target-blank-using-prototype/
//

Event.observe(window, 'load', function() {
    $$('a[rel="external"]').each(function(link){
        if(link.readAttribute('href') != '' && link.readAttribute('href') != '#'){
            link.writeAttribute('target','_blank');
        }
    });
});