var mycars = new Array();
mycars[0] = "Saab";
mycars[1] = "Volvo";
mycars[2] = "BMW";

localStorage.mycars=?;

var mycars = new Array();
mycars[0] = "Saab";
mycars[1] = "Volvo";
mycars[2] = "BMW";

localStorage["mycars"] = JSON.stringify(mycars);

var cars = JSON.parse(localStorage["mycars"]);