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: 3682	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/3682/81ea0800bc8ad92d491743716cd489cad7333723/dragdrop.js/buggy/vendor/rails/railties/html/javascripts/dragdrop.js