How to put array to store?

i got some EXTJS(javascript) code here:

var plik = document.getElementById("myFile");
var x = file_get_contents(plik.value);
var x = x.split(";");

and it returns:

["1", "2", "3", "4", "5", "645", "32213", "55645645", "123123213", "534534543534543242"]

I would like to put it to

        var store = new Ext.data.ArrayStore ({
                    data: myData,
                });

But i dont know, how to transform array correctly just as here:

 var myData = [
        ['3m Co'],
        ['Alcoa Inc'],
        ['Altria Group Inc'],
        ['American Express Company'],
        ['American International Group, Inc.']
];

Please, gimme some clues because it is annoying :(