Character Appearance Property? [closed]

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)