rem: return drop._containers.detect(function(c) { return parentNode == c }); 
add: return drop._containers.detect(function(c) { return containmentNode == c }); 
context:     return drop._containers.detect(function(c) { return parentNode == c });
meta: 3974	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3974/af9adbf17404d887f31369756326b0109da7ae2b/dragdrop.js/buggy/root/static/js/dragdrop.js