function CookieManager() {
}
CookieManager.prototype.get = function(name) {
    var nameEQ = name + "=";
    var cookieArray = document.cookie.split(';');
    for(var i=0;i < cookieArray.length;i++) {
        var cookie = cookieArray[i];
        while (cookie.charAt(0) == ' ') cookie = cookie.substring(1, cookie.length);
        if (cookie.indexOf(nameEQ) == 0) return cookie.substring(nameEQ.length,cookie.length);
    }
    return null;
};
CookieManager.prototype.create = function(name, value, days) {
    var expires;
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        expires = "; expires="+date.toGMTString();
    } else {
        expires = "";
    } 
    document.cookie = name+"="+value+expires+"; path=/";
};
CookieManager.prototype.erase = function(name) {
    this.create(name, "", -1);
};