$(document).ready(function() {	
        $("#contactsform").submit(function(){
            $('#contactsform #submit_btn').attr('disabled','disabled');
            
            $("#contactsform #result_contactos").html('<img src="/design/ajax-loader.gif" class="loader" alt="Loader" width="20" height="20"/>');
            
            $(this).ajaxSubmit({
                url: '/contacts_validation.php',
                target: 'div#result_contactos',
                success: function() { 
                    $('#contactsform #result_contactos img.loader').fadeOut(500,function(){$(this).remove()});
                    $('div#result_contactos').fadeIn('slow');
                    $('#contactsform #submit_btn').removeAttr('disabled');
                }
                });
            return false;
        });
    });