With Javascript (AJAX) it wouldn't be, but with a little Java or Flash it is. (I'm not 100% sure on Flash, but I bet it's possible)
I think Facebook uses Java for this bit (not totally sure, and I don't want to have to log in just to check)
I think Facebook uses Java for this bit (not totally sure, and I don't want to have to log in just to check)
particularly annoying when uploading to S3, since you have to go client->server->client->server->S3.