Question

should this work? Am i missing something?

var this_array = [

    [],

    [
        [],
        [
            [],
            [
                [],
                [
                    ['50.3']
                ],
                [
                    ['12.0']
                ]
            ]
        ]
    ],
    [
        [],
        [
            [],
            [
                [],
                [
                    ['85.3']
                ],
                [
                    ['31.1']
                ]
            ]
        ]
    ]
];

$(document).ready(function () {
    alert(this_array[1][1][1][1][0]);
}

Answer 1

Works for me: http://jsfiddle.net/Ny8ze/

Are you getting any errors?