Pass variable to game from HTML

Hi,

I have a game, containing 4 characters, only one character will be visible during game play, this character must be selectable from HTML.

Is it possible to send a var to the game from HTML, to select which character to make visible during the game. This must be done from HTML or an extra param on the URL, js, etc... but no PHP.

Any suggestions?

Tks.

php & ajax me thinks, but not sure how