ok, well that still stops "them" right? haha
i guess you want to be able to use it, but not allow others to.
try adding a required argument to playVideo, something to make it slightly more difficult to abscound:
Code:
var oldPlay=player.playVideo;
player.playVideo=function(password){
if(password=="something"){ oldPlay.call(player); }
};
then change your buttons from "player.playVideo()" to "player.playVideo('something')"...
you can change the argument and the password at the same time using a server-side script if you want to prevent them from hard-coding the 'password'...