return str.substr(0, str.length-1); 
return str.slice(0, -1); 
function serializeParams(params) {  var str = '';  for (var key in params) {    str += key + '=' + encodeURIComponent(params[key]) + '&';  }  return str.substr(0, str.length-1);}
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/61d2781275263f67ca27358e263e31006645e553/reportWizard.js/clean/extensions/reporter/resources/content/reporter/reportWizard.js