Data Won't Refresh? Cache?

I have a piece of flash that pulls data from a mySQL database via PHP.

If I load the page, then change the data in the SQL database, then refresh the page, the data does not update?

How can I make sure that the data is pulled from the database everytime the page is loaded?

How can I use the

dummyVar=" add getTimer(),"POST"

within the following string?