var arr = [
    {"quote":"Me encanta la bicicleta", "author":"Yunior, Holguin"},
    {"quote":"La vita necesita más café y menos estrés", "author": "Café Maguana" },
    {"quote":"Sta rottura de cojoni dei fascisti", "author": "Ivano Ceccarelli" },
    {"quote":"It never gets easier, you just go faster", "author": "Velominati" },
    {"quote":"Respect the earth; don’t litter", "author": "common sense™"},
    {"quote":"Lo vedi, lo fai, lo insegni", "author":"Ciclofficina Ruotalibera" },
    {"quote":"Never lift your bike over your head", "author": "Velominati"},
    {"quote":"Padre Pio amico degli sbirri", "author": "Heavy Merda" },
    {"quote":"Come un serpente indotto a camminare", "author": "Attrito"},
    {"quote":"Fight for your right to party", "author": ""},
    {"quote":"No hagas planes en Cuba", "author": "el Gato"}
];

function random(l)
{
    return Math.floor(Math.random() * l);
}

function generateRandomQuote()
{
    var n = random(arr.length);
    var author = arr[n].author ? (" - " + arr[n].author) : "";
    document.getElementById("quote").innerHTML = arr[n].quote + author;
}

generateRandomQuote();