You'll never make it so I can't vote again. That's why online polls/petitions mean < 0. As for the rest.. you'll have to have a form with your buttons and a submit. After submission, tally the results and post them to the user. You'll need a database to store your results. To at least try and prevent a user from re-submitting, store a cookie on their system with some value, check for the cookie upon submission and if it exists, don't let the submission continue.
