gistfile1.js

var Data = {
	_ownKeys: [],
	_similar: [],
	_appKey: 'listenAnywhere',

	set: function(key, value)
	{
		var existingValue = localStorage.getItem(this._appKey);
		if (null === existingValue) {
			existingValue = {};
		} else {
			existingValue = JSON.parse(existingValue);
		}
		existingValue[key] = value;

		try {
    		localStorage.setItem(this._appKey, JSON.stringify(existingValue));
		} catch (e) {
		    if (e == QUOTA_EXCEEDED_ERR) {
		        localStorage.removeItem(this._appKey);
		        var temp = {};
		        temp[key] = value;
		        localStorage.setItem(this._appKey, temp);
		        this._ownKeys = [];
		    }
		}
		this._ownKeys.push(key);
	},
	get: function(key)
	{
		return JSON.parse(localStorage.getItem(this._appKey))[key];
	},
	has: function(key)
	{
		return contains(this._ownKeys, key);
	},

	// keep similar live and in localStorage
	setSimilar: function(key, value) {
		this._similar = value;
		this.set(key, value);
	},
	hasSimilar: function(uri) {
		return contains(this._similar, uri);
	}
}