I add lots of java server-side reference code within and inbtween my static html/javascript. so unless the client code is not too dependent on any back-end code

I add lots of java server-side reference code within and inbtween my static html/javascript. so unless the client code is not too dependent on any back-end code, or aleast not more then say passing a few paramerter or xml request/response, then I wouldn't go with any other ui. the main test for me is, is this, say flash client going to end up being a fat client? if it is then it's not the right choice