localstorage polyfill I found somewhere online

localstorage_fallback.js

if (!window.localStorage) {  
  window.localStorage = {  
    getItem: function (sKey) {  
      if (!sKey || !this.hasOwnProperty(sKey)) { return null; }  
      return unescape(document.cookie.replace(new RegExp("(?:^|.*;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*((?:[^;](?!;))*[^;]?).*"), "$1"));  
    },  
    key: function (nKeyId) { return unescape(document.cookie.replace(/\s*\=(?:.(?!;))*$/, "").split(/\s*\=(?:[^;](?!;))*[^;]?;\s*/)[nKeyId]); },  
    setItem: function (sKey, sValue) {  
      if(!sKey) { return; }  
      document.cookie = escape(sKey) + "=" + escape(sValue) + "; path=/";  
      this.length = document.cookie.match(/\=/g).length;  
    },  
    length: 0,  
    removeItem: function (sKey) {  
      if (!sKey || !this.hasOwnProperty(sKey)) { return; }  
      var sExpDate = new Date();  
      sExpDate.setDate(sExpDate.getDate() - 1);  
      document.cookie = escape(sKey) + "=; expires=" + sExpDate.toGMTString() + "; path=/";  
      this.length--;  
    },  
    hasOwnProperty: function (sKey) { return (new RegExp("(?:^|;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=")).test(document.cookie); }  
  };  
  window.localStorage.length = (document.cookie.match(/\=/g) || window.localStorage).length;  
}