You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 16

if ($_POST["submit_add"])
{

  $error = array();
// Проверка полей
   if (!$_POST["form_title"])
  {
     $error[] = "Укажите название товара";
  }
   if (!$_POST["form_price"])
  {
     $error[] = "Укажите цену";
  }

// Проверка чекбоксов

   if ($_POST["chk_visible"])
   {
      $chk_visible = "1";
   }else { $chk_visible = "0"; }
   if ($_POST["chk_new"])
   {
      $chk_new = "1";
   }else { $chk_new = "0"; }
   if ($_POST["chk_leader"])
   {
      $chk_leader= "1";
   }else { $chk_leader = "0"; }
   if ($_POST["chk_sale"])
   {
      $chk_sale = "1";
   }else { $chk_sale = "0"; }                   

   if (count($error))
   {           
        $_SESSION['message'] = "<p id='form-error'>".implode('<br />',$error)."</p>";
   }else
   {
                mysql_query("INSERT INTO table_products(title,price,seo_words,seo_description,mini_description,description,mini_features,features,new,leader,sale,visible,type_tovara)
                    VALUES(                     
                        '".$_POST["form_title"]."',
                        '".$_POST["form_price"]."',
                        '".$_POST["form_seo_words"]."',
                        '".$_POST["form_seo_description"]."',
                        '".$_POST["txt1"]."',
                        '".$_POST["txt2"]."',
                        '".$_POST["txt3"]."',
                        '".$_POST["txt4"]."',
                        '".$chk_new."',
                        '".$chk_leader."',
                        '".$chk_sale."',
                        '".$chk_visible."',
                        '".$_POST["form_type"]."',                              
                    )")or die("Ошибки запроса: " . mysql_error());
  $_SESSION['message'] = "<p id='form-success'>Товар успешно добавлен!</p>";
  $id = mysql_insert_id();
   if (empty($_POST["upload_image"]))
  {        
  include("actions/upload-image.php");
  unset($_POST["upload_image"]);           
  } 
   if (empty($_POST["galleryimg"]))
  {        
  include("actions/upload-gallery.php"); 
  unset($_POST["galleryimg"]);                 
  }
 }

 }