Create a Success Message using Dynamic Action - Second

You can extend this simple example by adding a counter to it and close it after the specified number of seconds:

var my_counter = 5;

var success_message = $('#P299_MESSAGE').val() + '<br/>' 
+ 'This message will close in ' + 
'<span id="my_sec">' + my_counter + '</span>' + ' seconds.';
$('.t10messages').empty();
$('.t10messages').append(<div class="t10success" style="display: none;">
</div>
');
$('.t10success').append(success_message);
$('.t10success').fadeIn(1000);

var time_in_seconds = setInterval(function() {

my_counter--;

$('#my_sec').empty();
$('#my_sec').append(my_counter);

if (my_counter == 0) {
    clearInterval(time_in_seconds);
    $('.t10success').fadeOut(1000);
    }
}, 1000);

Using jQuery this is quite easy to acomplish.