How to create this object in javascript?

[alFReD-NSH]

I'm writing a script in javascript(actually a chrome extension) and I need an object that I can write to it like this(sorry, don't know how to explain it better) and then I convert it to string with format of json.

id[129].weekDay[6].hour[23] = 0

Here, id is an array, that each element in it contain another array(weeksDay) and in that array each contain another array(hour).
The id indices are unlimited, for weekDay 7 and hour 24.

I searched in google but i couldn't find what I wanted. Actually don't know the best keyword to search.(objects in arrays?)

I don't know what exactly it is called, I can write it's declaration in VB.NET if that helps you.

[Old Pedant]

Example:

// constructor for a DAY object:
function DAY( )
{
    this.hour = [];
    this.minute = [];
    this.second = [];
}
// constructor for a WEEK object:
function WEEK( start, days )
{
    this.startDate = start;
    this.weekDay = days == null ? [] : days;
}

var id = []; // an array of WEEK objects

var d = new DAY( );
d.hour[16] = "School lets out";
var w = new WEEK( new Date(2011,6,16) ); // notice only one argument supplied
w.weekDay[6] = d;

id[129] = w;

// an then:
alert( id[129].weekDay[6].hour[16] ); // would alert "School lets out"