Can't have multiple pan animations

[hellomrdavis]

Love this plugin but I've run into something I can't seem to find the workaround for. If I have one panning animation everything works fine. However, if I add another it stops all animations and breaks.
Here's what I have. Simple enough:

$('.blimp').pan({fps: 30, speed: 1, dir: 'right'});
$('.clouds').pan({fps: 30, speed: 1, dir: 'left'});