FB.Event.subscribe('comment.create',function(response) {fb_comment_added(); });
FB.Event.subscribe('comment.deleted', function(response) {fb_comment_deleted(); });

VK.Observer.subscribe('widgets.comments.new_comment', function(num, text,ts) {vk_comment_added(num, text, ts)});

function fb_comment_added() {
  fb_synch_comments();
}

function vk_comment_added(num, text, ts) {
  var url = '/wp-content/plugins/facebook-comments/facebook-comments-ajax.php?vk_url='+document.location+'&vk_text='+text+'&vk_ts='+ts;
  AjaxRequest(url);
}

function fb_synch_comments() {
  AjaxRequest('/wp-content/plugins/facebook-comments/facebook-comments-ajax.php?url='+document.location);
}