// requires json2.js for all browsers other than Firefox 3.5
if (!window.sessionStorage && JSON) {
	window.sessionStorage = (function () {
		// window.top.name ensures top level, and supports around 2Mb
		var data = window.top.name ? JSON.parse(window.top.name) : {};
		return {    
			setItem: function (key, value) {
				data[key] = value+""; // force to string
				window.top.name = JSON.stringify(data);
			},
			removeItem: function (key) {
				delete data[key];
				window.top.name = JSON.stringify(data);        
			},
			getItem: function (key) {
				return data[key] || null;
			},
			clear: function () {
				data = {};
				window.top.name = '';
			}
		};
	})();
}