Character Appearance Property?

Is there a way I can access the character appearance property found in each player that enters (which is found under game.Players)? And if so can I use to change how people look as soon as they enter?

This doesn't seem to work when I put it in a script in the workspace!:(

function onPlayerAdded(player)
player.CharacterAppearance = "http://www.roblox.com/Asset/CharacterFetch.ashx?userId=261" --the last numbers of the URI is the ID of the desired character look
end
game.Players.PlayerAdded:connect(onPlayerAdded)

Turn this property to false when the player enters.

What it does is make the player unable to load the character appearance to the corresponding player which allows you to change the appearance.

Not 100% if it will work, though.