Deferred objects. On done several ajax calls

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
<div class="container">
    <div class="row">
        <div class="span2">
            <a href="#" id="third-call" class="btn btn-primary btn-large">Tercera llamada</a>
        </div>
    </div>    
</div>

CSS

.row {
    margin-bottom:20px;
}

JavaScript

var thirdCall = function(){
    var thirdAjaxCall = $.ajax({
        url: '/echo/json/',
        type: 'POST',
        data: {
            json: JSON.stringify({name: 'veamospues'}),
            delay: 1 
        }
    });
    
    var fourthAjaxCall = $.ajax({
        url: '/echo/json/',
        type: 'POST',
        data: {
            json: JSON.stringify({url: 'http://www.veamospues.wordpress.com'}),
            delay: 3
        }
    });
    
    $.when(thirdAjaxCall, fourthAjaxCall).done(function(dataName, dataUrl){
        alert(dataName[0].name + " ("+dataUrl[0].url+")");
    });
    
};

$(document).ready(function(){
    $('#third-call').click(thirdCall);
});