var movePhotoCredit = new Fx.Style('photo-credit', 'right', {duration:700});
movePhotoCredit.set(-233);

$('photo-container').addEvent('mouseenter', function(){
	movePhotoCredit.start(-233, 0);
});

$('photo-container').addEvent('mouseleave', function(){
	movePhotoCredit.start(0, -233);
});