How configure reconnecting in socket.io?

This is an old question, but for other people like me, who are looking how to configure reconnect in socket.io (1.x) here is a correct syntax:

var socket = new io.connect('http://localhost:8181', {
    'reconnection': true,
    'reconnectionDelay': 1000,
    'reconnectionDelayMax' : 5000,
    'reconnectionAttempts': 5
});