function voteUp(id, itemtype) {
  killVoting(id);
  ajaxGet(null, '/ajax_vote.aspx?i='+id+'&type='+itemtype+'&v=1', false);
  return false;
}
function voteDown(id, itemtype) {
  killVoting(id);
  ajaxGet(null, '/ajax_vote.aspx?i='+id+'&type='+itemtype+'&v=-1', false);
  return false;
}
function killVoting(id) {
    var imgvoteup = document.getElementById('imgvoteup'+id);
    var imgvotedown = document.getElementById('imgvotedown'+id);
    imgvoteup.src='/images/icons/voteup_grey.gif';
    imgvotedown.src='/images/icons/votedown_grey.gif';
    var voteup = document.getElementById('voteup'+id);
    var votedown = document.getElementById('votedown'+id);
    voteup.onclick='return false;'
    votedown.onclick='return false;'
}