HTML does not support a streaming concept - it is a request/response sort of thing. However, you can get it to refresh periodically.
You might want to consider using the remote front panel feature in LabVIEW. This allows you to host your VI's front panel in a browser so that other people can watch it. This does allow for live data streaming. The only catch is that the LV runtime will be installed on their machines, but the program itself continues to run on the server machine. If you are using LV 7, check out chapter 18 of the user's guide - there are several ways decribed there.