Full web url with URLLoader how do i

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HI
how would i get a full web url using urlloader.
i need to get the php file + the room id

priceLoader.load(new URLRequest("player.php"));

in php i could write this player.php?roomID=$roomID

HOW DO I PASS THE ROOM ID USING AS3 URLREQUEST
can’t do this

priceLoader.load(new URLRequest("player.php?roomID=$roomID"));

Tried this

priceLoader.load(new URLRequest("player.php?roomID"=+roomID ));

HOW DO I DO THIS IN AS3
thanks paul