The button is going to be a flip flop switch. Initially it will show as [+1] if you have not voted and this will count as a vote up.

After you vote the button changes to [-1] and this means you can click it to withdraw your vote.

The text next to the button will show "No votes yet", or the number of votes received.

I am not implementing a down vote like other sites. You can vote +1 to show satisfaction with the post, approval, support or similar things.

This button will only show if you are logged in.

Obviously "ANSWER" is still used to set a reply/ies as the answer(s) to a topic question.