I can't see the animation in my browser (Firefox), but the code to set up the animation on a click would be the following.
$('.alt0').click(function(){
$(this).animate({width: '480px'}, 4000, function(){
updateStatus('Animation 1 Complete');
});
});
$('.alt1').click(function(){
$(this).animate({width: '480px'}, 5000, function () {
updateStatus('Animation 2 Complete');
});
});
$('.alt2').click(function(){
$(this).animate({width: '480px'}, 20000, function () {
updateStatus('Animation 3 Complete');
});
});