gistfile1.js

//dartlang:
document.query('#next').on.click.add((e) {
    sliderMenu.selectNext(true);
});

//javascript:

var next = document.getElementById('next');
function cb() {
    sliderMenu.selectNext(true);
}
if (!!next.addEventListener) {
    next.addEventListener('click', cb);
} else {
    next.attachEvent('click', cb);
}