Description

hoverclass does not allow for swapping a background-image, and onHover has no opposite. Here are my modifications to implement:

  deactivate: function(drop, drag, dropElement, overlap) {
    if(drop.hoverclass)
      Element.removeClassName(drop.element, drop.hoverclass);
    this.last_active = null;
    if (this.last_active.onUnHover)
      this.last_active.onUnHover(drag, dropElement, overlap);
  },

and on line 4 of the show function:

    if(this.last_active) this.deactivate(this.last_active, element, drop.element, Position.overlap(drop.overlap, drop.element));