Declaring an empty array

Declaring an empty array

Hi,
I am a bit new to jquery.
What I want to do is declare an empty array.
so i do it like this:


var changedValues = {};


Now i m populating this array dynamically with values, something like this

changedValues[elemName] = elemValue;


This also works fine.
BUT, when i do a

alert(changedValues.length)
....

it gives "UNDEFINED" even though the array is not empty. Saw it through firebug .. Can anyone tell me wht is happening here?
Or if any1 can provide a better method.
Thanks for the help.