Untitled

// Adicionando listener para right-click
Object.extend(Event, {
 isRightClick: function(event) {
    return (((event.which) && (event.which == 1)) ||
            ((event.button) && (event.button == 2)));
  }
});

document.observe("dom:loaded", function() {
    $A(document.documentElement.select('[rightClick]')).each(function(i){
        i.observe('contextmenu', function(){ eval(i.readAttribute('rightClick')) });
    });
});