rem: ff = agree(ff, function(elem){ return (elem.tagName.toLowerCase() == tn); }); 
add: return function(elem){ return ((getNodeIndex(elem) % pred) == idx); } 
context: 				ff = agree(ff, function(elem){					return (elem.tagName.toLowerCase() == tn);				});
meta: 4497	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4497/9d2d8b07235702c69fc064ab917871332f42d825/query.js/clean/_base/query.js