rem: return str.substr(0, str.length-1); 
add: return str.slice(0, -1); 
context: function serializeParams(params) {  var str = '';  for (var key in params) {    str += key + '=' + encodeURIComponent(params[key]) + '&';  }  return str.substr(0, str.length-1);}
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/87c335a1d04c279be42fe0b7e00fb48a7639f8bf/reportWizard.js/clean/extensions/reporter/resources/content/reporter/reportWizard.js