Save application state in a cookie

function cookieTime(days){
 var now = new Date();
 var exp = new Date();
 var x = Date.parse(now) + days*24*60*60*1000;
 exp.setTime(x);
 str = exp.toUTCString();
 re = '/(\d\d)\s(\w\w\w)\s\d\d(\d\d))/';
 return str.replace(re,"$1-$2-$3");
}
 
//set cookie:
    var cookieName;  //should be set to something unique
    var stateAsString;  //should be set to a string indicative of the state being saved
    document.cookie = someString+'='+stateAsString+';path=/;expires='+cookieTime(365);
 
//get cookie
    var re          = new RegExp(cookieName+'=(.*)');
    var state       = re.exec(document.cookie);
    var lastState   = (state) ? state[1].split(';')[0] : 'default state';
 
/* or, more formally */
var cookieJar: {
    setState: function ( id, value) {
      document.cookie = id+'='+value+';path=/;expires='+cookieTime(365);
    },
    getState: function( id, defaultState ) {
      var re          = new RegExp(id+'=(.*)');
      var state       = re.exec(document.cookie);
      return (state) ? state[1].split(';')[0] : defaultState;
    }
}