Hi,
I am interested in the job. I could not open the link you have provided, could it be something missing? Nevertheless, I do know how to add highscores to a flash game.
I have some questions in order to understand exactly what you need:
1. Do you already have a flash game and want me to integrate a highscores component?
2. or you just want to learn how to do it by yourself?
To add highscores, one usually needs a server side database to store the information. Then, flash communicate with the server to add-extract the info. I can do this using php scripts.
please let me know,
Best,
Oliver