[jQuery] How to obtain Object (key) names?

[Frederic Laruelle]

Hi,

I;m looking for a way to obtain key names from a JSON object:
eg
"options": [
                {"Option1" : ["Value1", "Value2"]},
                {"Option2" : ["Value3", "Value4"]},
                {"Option3" : ["Value5", "Value6"]}
                ]

so, i'd like to consume this JSON in a way similar to this:
$.each(JSON.options., function(i, option) {
        if (option.name == "Option1") {
                       // do something
                       }
});

Prototype seems to have a keys method which would achieve what i'm
looking for.
There are also a few pages which attempt to address the issue with
JQuery, such as: http://snipplr.com/view/10430/jquery-object-keys/
However i was only able to retrieve the numerical index of the array
elements using these methods (vs their name).

Any help appreciated.

Tks!

Fred~