Javascript AMD Cookie Manager Module

gistfile1.js

define([], function () {
    
    var CookieManager = function() {};
    
    CookieManager.prototype.createCookie = function(name, value, days) {
        if (days) {
            var date = new Date();
            date.setTime(date.getTime()+(days*24*60*60*1000));
            var expires = "; expires="+date.toGMTString();
        } else {
            var expires = "";
        } 
        document.cookie = name+"="+value+expires+"; path=/";
    }

    CookieManager.prototype.readCookie = function(name) {
        var nameEQ = name + "=";
        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,c.length);
            } 
            if (c.indexOf(nameEQ) == 0) {
                return c.substring(nameEQ.length,c.length);
            }
        }
        return null;
    }

    CookieManager.prototype.eraseCookie = function(name) {
        createCookie(name,"",-1);
    }
    
    return new CookieManager; 
});