window.addEvent('domready', function() { 
    document.getElements('a').each(function(el) { 
        if (el.hasClass('popup-link')) { 
            el.addEvent('click', function(e) { 
                e = new Event(e); 
                e.stop();     
                window.open(this.getProperty('href')); 
            }.bind(el)); 
        }     
    }); 
});