[jQuery] Ajax Idea: Would like some feedback

I develop a tchat in ajax and needed to save some space in the json
that comes back from the server, so instead of sending messages like
[Name:Value,Name:Value,......] which can get quite big if you return a
collection of 50-100 users with lots of info, i wanted something more
like [Value,Value,Value] but still be able to acess the object in a
normal way, and came up with this:

<!-- start code -->

//Simulate the json object
var ref_data  = {value:[["Marcel",31,"Paris"],["Karl",
15,"Germany"]],ref:["Name","Age","City"]};

// Function to merge a value collection and a ref
// table back to a name/value collection
function ObjMerge(obj){
    var out = [];
    $.each(obj.value, function(i, o){
        out[i] = [];
        $.each(obj.ref, function(ii, oo){
            out[i][oo] = o[ii];
        });
    });
    return out;
}

// Merge the json response
var users = ObjMerge(ref_data);

// test it out!
// could use this too:  users[xx].Field
$.each(users, function(i,n){
   alert("Name: "+n.Name+", Age: "+n.Age+", City: "+n.City);
});

<!-- end code -->


I'm no pro in javascript so if anyone sees something that could go
wrong or be done better, feel free to suggest !

Thank's,
Robert