JQuery Animate Background Image on Y-axis

Question

I seem to experiencing a problem with the JQuery animation. I can animate the background image in the positive direction, but not in the negative direction. Any suggestions

Answer 1

@adeneo: this solution only works if you set

this.x = pos[0].split('px')[0] || 0;
this.y = pos[1].split('px')[0] || 0;

Otherwise the starting position will be set to zero.