rem: element._revert = new Effect.MoveBy(element, -top_offset, -left_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;        element._revert = new Effect.MoveBy(element, -top_offset, -left_offset, {duration:dur});      },
meta: 6359	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/6359/52d313976f72b3f30c833a7675d476a595bc284d/dragdrop.js/buggy/web/js/dragdrop.js