Node.js or Java Script Expert : please need help

I need you to update server.js file to add support to JPEG

------server.js----- var fs = require('fs'); var path = require('path'); var http = require('http'); function send404(response) { response.writeHead(404, { 'Content-Type': 'text/html' }); response.write('Error 404: Resource not found.'); response.end(); } var mimeLookup = { '.js': 'application/javascript', '.html': 'text/html', }; var server = http.createServer(function (req, res) { if (req.method == 'GET') { // resolve file path to filesystem path  var fileurl; if (req.url == '/') fileurl = '/index.html'; else fileurl = req.url; var filepath = path.resolve('./' + fileurl); // lookup mime type  var fileExt = path.extname(filepath); var mimeType = mimeLookup[fileExt]; if (!mimeType) { send404(res); return; } // see if we have that file  fs.exists(filepath, function (exists) { // if not  if (!exists) { send404(res); return; }; // finally stream the file  res.writeHead(200, { 'content-type': mimeType }); fs.createReadStream(filepath).pipe(res); }); } else { send404(res); } }).listen(3000); console.log('server running on port 3000');