Need to shift a div 50 pixels left...how?

I am using Interface, and even though support is limited / disabled,
how would one take an element, such as a div and using an onclick on a
link, move that div in a particular direction pixels.
Specifically
If I had a link that when clicked, a DIV with ID #box1, would shift to
the left 50 pixels.
Whether its interface or UI, what would be the code to execute this?
Thanks,
Bryan