rem: new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur}); 
add: new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur, queue: {scope:'_draggable', position:'end'} }); 
context:       reverteffect: function(element, top_offset, left_offset) {        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;        Draggable._revertCache[element] =          new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur});      },
meta: 7994	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/7994/c31fdc38f767373d22b3dd5a5072aa4962ca5b65/dragdrop.js/buggy/src/dragdrop.js