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HTML5 Local Storage with Expiration = {
save : function(key, jsonData, expirationMin){
if (!Modernizr.localstorage){return false;}
var expirationMS = expirationMin * 60 * 1000;
var record = {value: JSON.stringify(jsonData), timestamp: new Date().getTime() + expirationMS}
localStorage.setItem(key, JSON.stringify(record));
return jsonData;
load : function(key){
if (!Modernizr.localstorage){return false;}
var record = JSON.parse(localStorage.getItem(key));
if (!record){return false;}
return (new Date().getTime() < record.timestamp && JSON.parse(record.value));
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