$(document).ready(function() {
    $('#subscribed').hide();
    $('#subscribe-submit').bind('click', 
    function(){ 
        if($('#subscribe-email').val() == ''){
            alert('Please enter your email address.');
            return;
        }
        var options = {
            complete: function(){ 
                $('#formDiv').fadeOut(function(){
                    $('#subscribed').fadeIn();
                });
            }     
        };
        $('#subscribe-form').ajaxSubmit(options);
    });
});