Don't make it a button, but make it a command that you can type in chat. This works in counter-strike. Players would be able to type "voteban 'player'" and if there were enough votes it would ban the player.

To get a good result you would have to play 999 minutes which is 16 hours and 39 minutes. That is a bit too much time for me. Somebody could even die from it maybe :-) .

strid3r

works