JavaScript: multidimensional Dictionary

Hi all,

I have a problem to get some values from the multidimensional dictionary. I have a dict like this:
{
    “Level 1 - A“ :     {
        “Level 2 - a” : [ 1, 2, 3 ],
        “Level 2 - b” : [ 4, 5, 6 ],
        “Level 2 - c” : [ 7, 8, 9 ]
    }
,
    “Level 1 - B” :     {
        “Level 2 - a” : [ 10, 20, 30 ],
        “Level 2 - b” : [ 40, 50, 60 ],
        “Level 2 - c” : [ 70, 80, 90 ]
    }
,
    “Level 1 - C” :     {
        “Level 2 - a” : [ 100, 200, 300 ],
        “Level 2 - b” : [ 400, 500, 600 ],
        “Level 2 - c” : [ 700, 800, 900 ]
    }
}

I can get the list of the keys via JavaScript by this:
function getKeys () {
    var keys = myArray.getkeys();
    post (keys);
}

=> “Level 1 - A“, “Level 1 - B“, “Level 1 - C”.

The question is, how can I get the “keys” of the “Level 1 - A” dictionary, please? So my expected result is:
=> “Level 2 - a”, “Level 2 - b”, “Level 2 - c”.

In Max, I can make an object:
[dict.unpack “Level 1 - A“: “Level 1 - B“: “Level 1 - C”:]
But this doesn’t work very well with the spaces, and it’s not so flexible, as I need to. So I would like to write it in the JavaScript.

Thanks!