Otto - Population

function criteo_population(){
    // Settings
    var cookiename_cto = "cto"; //Name of the cookie
    var splitRate_cto = 50; //Split rate between the 2 partners

    // Check if cookie already exits
    var population_cto = '';
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(cookiename_cto + "=") == 0){
            population_cto = c.substring(cookiename_cto.length, c.length);
            population_cto = population_cto.split('=')[1]; // Returns A or B
        }
    }

    // Populate the cookie, as there is no pool present in the cookie
    if(population_cto == '' || population_cto == undefined){ console.log("we generated again a population value");
        population_cto = (((Math.random() * 100 | 0) + 1) <= splitRate_cto) ? "A" : "B";
    }

    var date = new Date();
    date.setTime(date.getTime()+(365*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
    var default_path = "; path=/"; // really important so the var will be reachable from any page of the website
    document.cookie = cookiename_cto+"="+population_cto+expires+default_path;
    return population_cto; // Returns A or B
}