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: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/61d2781275263f67ca27358e263e31006645e553/reportWizard.js/buggy/extensions/reporter/resources/content/reporter/reportWizard.js