JavaScript: Localstorage polyfill

javascript:localstorage.cookie.js

var createCookie, readCookie;
if (!window.localStorage) {

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

    readCookie = function(name) {
        var result = "",
            nameEQ = name + "=",
            ca = document.cookie.split(';'),
            i, c;
        for (i = 0; i < ca.length; i++) {
            c = ca[i];
            while (c.charAt(0) == ' ') {
                c = c.substring(1, c.length);
            }
            result = c.indexOf(nameEQ) === 0 ? c.substring(nameEQ.length, c.length) : "";
        }
        return (result);
    };

    localStorage = (function() {
        return {
            setItem: function(key, value) {
                createCookie(key, value, 3000);
            },
            getItem: function(key) {
                return (readCookie(key));
            }
        };
    })();
	
}

javascriptlocalstorage.cookie.js

var createCookie, readCookie;
if (!window.localStorage) {

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

    readCookie = function(name) {
        var result = "",
            nameEQ = name + "=",
            ca = document.cookie.split(';'),
            i, c;
        for (i = 0; i < ca.length; i++) {
            c = ca[i];
            while (c.charAt(0) == ' ') {
                c = c.substring(1, c.length);
            }
            result = c.indexOf(nameEQ) === 0 ? c.substring(nameEQ.length, c.length) : "";
        }
        return (result);
    };

    localStorage = (function() {
        return {
            setItem: function(key, value) {
                createCookie(key, value, 3000);
            },
            getItem: function(key) {
                return (readCookie(key));
            }
        };
    })();
	
}

function getStored(sKey, sDefault) {
	var val = localStorage.getItem(sKey);
	if (typeof sDefault!=='undefined' && val===null) {
	  val = sDefault;
	  localStorage.setItem(sKey, val);
	}
	return val;
}

alert(getStored('test', 111));