rem: var p = [0,1].map(function(i){ return (point[i]-pos[i]-this.offset[i]) }.bind(this)); 
add: this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) }); 
context:     var p = [0,1].map(function(i){ return (point[i]-pos[i]-this.offset[i]) }.bind(this));
meta: 6601	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/6601/28b3187d07d97712c23182569a4d6fd00900b5f7/dragdrop.js/buggy/javascript/script.aculo.us/dragdrop.js