def vote_up
@question = get_question params[:id]
if current_user != @question.user
  render :json => @question.vote(current_user, 'up').to_json
 end
end

def vote_down
@question = get_question params[:id]
if current_user != @question.user
  render :json => @question.vote(current_user, 'down').to_json
 end
end

def vote(user, vote)
if user.voted?(self)
  'Question already voted'
else
  I18n.t('question.voted') if user.send("#{vote}_vote", self)
 end
end

<script>
 $('#question_vote_up').live('ajax:success', function(evt, data,    status, xhr) {
 $('#question_vote_up').remove()
 $('#question_vote_down').remove()
 alert(xhr.responseText)
 })

 $('#question_vote_down').live('ajax:success', function(evt, data,      status, xhr) {
 $('#question_vote_up').remove()
 $('#question_vote_down').remove()
 alert(xhr.responseText)
 })
 </script>

 <% if current_user != @question.user %>
 <%= link_to t('question.vote_up'), { :action => "vote_up" }, :id => "question_vote_up", :remote => true %>
 <%= link_to t('question.vote_down'), { :action => "vote_down" }, :id => "question_vote_down", :remote => true %>
 <% end %>

if current_user != @question.user

def getQuestion(direction)
  @question = get_question params[:id]
  if current_user != @question.user
      render :json => @question.vote(current_user, direction).to_json
  else
      render :nothing => true
  end
end

def vote_up
   getQuestion "up"
end

def vote_down
   getQuestion "down"
end