[javascript] Array inside a JavaScript Object?

I've tried looking to see if this is possible, but I can't find my answer.

I'm trying to get the following to work:

var defaults = {
 'background-color': '#000',
 color: '#fff',
 weekdays: {['sun','mon','tue','wed','thu','fri','sat']}
};

It just gives an error, and I've tried using ({...}) and [{...}] I'd like to be able to access the weekdays using something like:

defaults.weekdays[0];

is this possible?

In regards to multiple arrays in an object. For instance, you want to record modules for different courses

var course = {
    InfoTech:["Information Systems","Internet Programming","Software Eng"],
    BusComm:["Commercial Law","Accounting","Financial Mng"],
    Tourism:["Travel Destination","Travel Services","Customer Mng"]
};
console.log(course.Tourism[1]);
console.log(course.BusComm);
console.log(course.InfoTech);

var obj = {
 webSiteName: 'StackOverFlow',
 find: 'anything',
 onDays: ['sun'     // Object "obj" contains array "onDays" 
            ,'mon',
            'tue',
            'wed',
            'thu',
            'fri',
            'sat',
             {name : "jack", age : 34},
              // array "onDays"contains array object "manyNames"
             {manyNames : ["Narayan", "Payal", "Suraj"]}, //                 
           ]
};

// define
var foo = {
  bar: ['foo', 'bar', 'baz']
};

// access
foo.bar[2]; // will give you 'baz'