gistfile1.js

$('document').ready(function(){
  
    var usernames = ['cirpo', 
                     'merissimissima', 
                     'unlucio',
                     'sandropaganotti',
                     'odracci',
                     'gandellinux',
                     'pcamoz',
                     'idonghee',
                     'il_bosca',
                     'ilcironet'
                    ];
    
    $.each(usernames, function (index, name){
         $.ajax({

                url : "http://api.twitter.com/1/users/show.json?screen_name="+ name,
                dataType : "jsonp",
                success : function(data)
                {
                    $('#avatar_' + name ).attr('src', data.profile_image_url);
                    console.log('nome: '+ name + 'url: ' + data.profile_image_url);
                }

          });
        
        console.log(name);
    
    });
    
});