Flash Php url question

I would like to create a php page, that when called like mypage?id=123 passes to flash the var id but doesn’t re-insert the swf in the page.
What i mean i that i can create a php page and pass vars to flash, but what i would like to do is then call the same page from the embed flash with a new URL like mypage?id=1455 and re-pass that var to flash without reloading it or re-embedding it and whatnots. Possible?