Hi

dynamic 1a: when the banner loads, it calls a server for the current count ... but does not update (so if someone stares at the banner for a while, it would not change). Requires crossdomain files for the banner to be able to fetch the value
dynamic 1b: a php script on the server would fetch the value and stuff it into the embedding. Requires changes to the way the banner is installed on the website
dynamic 2: like 1a, but the banner would fetch new values every so often (e.g. once every 30 seconds)