class CEooVideoLikeHl {
  //$DB объект для работы с базой, здесь несущественно

  static public function getLikeCount($elemID) {	
  $intResult = 0; 
  if(intval($elemID) == 0)
    return $intResult;
  try {		
    $strSql = "SELECT count(*) col FROM eoo_video_like_hl WHERE UF_ELEMENT_ID=".$elemID." LIMIT 1;";
    $res = $DB->Query($strSql, false);
    if ($arRes = $res->Fetch()) {
      $intResult = $arRes["col"];	
    }
  } catch (Exception $e) { 
    log( "CEooVideoLikeHl::getLikeCount   Caught exception: ".$e->getMessage()."\n");
  }	
  return $intResult;		
}
	
static public function checkUserLike($userID, $elemID) {	
  $isVote = 0;
  if($userID && intval($elemID)>0) {
    $strSql = "SELECT count(*) col FROM eoo_video_like_hl WHERE UF_USER_ID=".$userID." and UF_ELEMENT_ID=".$elemID." LIMIT 1;";
    $res = $DB->Query($strSql, false);
    if($arRes = $res->Fetch())
      $isVote = intval($arRes["col"]);
  }	
  return $isVote;
}
	
static public function addLike($arFields) {		
  <..проверки входящих параметров, подотовка параметров для записи..>
  //$DB->StartTransaction();
  $ID = $DB->Insert("eoo_video_like_hl", $arInsertFields, $err_mess.__LINE__);
  //$DB->Commit();
  return $ID;
}	
	
static public function deleteLike($arFields) {
  <..проверки входящих параметров..>			
 if($DB->Query("DELETE FROM eoo_video_like_hl WHERE UF_ELEMENT_ID=".$videoID." and UF_USER_ID=".$userID))
  return true;			
 else 		
  return false;	
}
	
};

//$u = <id пользователя> 
//$elem = <id elementa> 
require_once(utils.php);
if($u > 0 && $elem > 0) { 
  $is_vote = CEooVideoLikeHl::CheckUserLike($u, $elem);
  if($is_vote == 0) { ?> 
    <div class="prod-buttons like-video" data-id="<?=$elem?>" data-href="/like_video/?id=<?=$u?>&mode=1" title="Like video">
      <img class="star-like" src="/images/hand_pro.png" />
      <span>Like</span>
    </div>				
  <?} else { ?>
    <div class="prod-buttons like-video" data-id="<?=$elem?>" data-href="/like_video/?id=<?=$u?>&mode=0" title="Unlike video" >
      <img class="star-like" src="/images/hand_pro.png" />
      <span>Unlike</span>
    </div>								
  <?}
} else { ?>
  <div class="prod-buttons like-video no-login" data-id="" data-href="" title="Like video">
    <img class="star-like" src="/images/hand_pro.png" />
    <span>Like</span>
  </div>				
<?}?>

$(".like-video").click(function(e){
  var self = $(e.currentTarget); 
  if(self.hasClass("disabled") || self.hasClass("no-login")) 
    return false;	
  $.post(self.attr("data-href"), function(data) {
    $(".grid-like-item>span").text(+data);
    if(+self.attr("data-vote") == 0){
      self.attr("title", "Unlike video");
      self.attr("data-href", "/like_video/?id="+self.attr("data-id")+"&mode=0");
      self.find("span").text("Unlike");
    } else {
      self.attr("title", "Like video");
      self.attr("data-href", "/like_video/?id="+self.attr("data-id")+"&mode=1");				
      self.find("span").text("Like");			
    }	
  });	
});

$e = intval($_REQUEST["id"]); 
$m = intval($_REQUEST["mode"]);
// $u = <id пользователя>
if($e>0 && $u>0) {
  $is_vote = CEooVideoLikeHl::CheckUserLike($u, $e) == 1;
  $id = 0;
  switch($m){
    case 0: 
      if($is_vote) {
        $arFields = array("ELEMENT_ID"=>$e, "USER_ID"=>$u);
        CEooVideoLikeHl::deleteLike($arFields);
      }	
      break;	
    case 1;
      if(!$is_vote) {
        $arFields = array("ELEMENT_ID"=>$e, "USER_ID"=>$u);
        $id = CEooVideoLikeHl::addLike($arFields);
      }	
      break;
    default: //do nothing	
      break;
    }	
}
echo CEooVideoLikeHl::getLikeCount($e);