Provides dragging (moving) capability for any DOM node
Modifies element mover such that clicking and moving on clicker will cause it to move. Additional options can be specified using optObj object:
var header = Dom.create("div");
var body = Dom.create("div");
body.appendChild(header);
Drag.create(header, body, {type:TYPE_XY});
Removes dragging relation between clicker and mover.
Removes all dragging relations from clicker.