diff --git a/classes/actions/ActionBlog.class.php b/classes/actions/ActionBlog.class.php
index 79731b81..dafe2a3c 100644
--- a/classes/actions/ActionBlog.class.php
+++ b/classes/actions/ActionBlog.class.php
@@ -854,7 +854,7 @@ class ActionBlog extends Action {
 			 * Проверяем текст комментария
 			 */
 			$sText=$this->Text_Parser(getRequest('comment_text'));
-			if (!func_check($sText,'text',2,3000)) {
+			if (!func_check($sText,'text',2,10000)) {
 				$this->Message_AddError('Текст комментария должен быть от 2 до 3000 символов и не содержать разного рода каку','Ошибка');
 				return false;
 			}
diff --git a/classes/modules/topic/mapper/Topic.mapper.class.php b/classes/modules/topic/mapper/Topic.mapper.class.php
index 448772bb..8d03e07d 100644
--- a/classes/modules/topic/mapper/Topic.mapper.class.php
+++ b/classes/modules/topic/mapper/Topic.mapper.class.php
@@ -547,12 +547,13 @@ class Mapper_Topic extends Mapper {
 	}
 	
 	public function GetTopicTagsByLike($sTag,$iLimit) {
+		$sTag=mb_strtolower($sTag,"UTF-8");		
 		$sql = "SELECT 
 				topic_tag_text					 
 			FROM 
 				".DB_TABLE_TOPIC_TAG."	
 			WHERE
-				topic_tag_text LIKE ?			
+				LOWER(topic_tag_text) LIKE ?			
 			GROUP BY 
 				topic_tag_text					
 			LIMIT 0, ?d		
diff --git a/classes/modules/user/mapper/User.mapper.class.php b/classes/modules/user/mapper/User.mapper.class.php
index 249ad43a..4006d77f 100644
--- a/classes/modules/user/mapper/User.mapper.class.php
+++ b/classes/modules/user/mapper/User.mapper.class.php
@@ -288,12 +288,13 @@ class Mapper_User extends Mapper {
 	}
 	
 	public function GetUsersByLoginLike($sUserLogin,$iLimit) {
+		$sUserLogin=mb_strtolower($sUserLogin,"UTF-8");
 		$sql = "SELECT 
 				user_login					 
 			FROM 
 				".DB_TABLE_USER."	
 			WHERE
-				user_login LIKE ?		
+				LOWER(user_login) LIKE ?		
 				and 
 				user_activate = 1								
 			LIMIT 0, ?d		
diff --git a/include/function.php b/include/function.php
index b0b3439a..77669fdf 100644
--- a/include/function.php
+++ b/include/function.php
@@ -22,11 +22,23 @@
  * @return unknown
  */
 if (!function_exists('mb_strlen')) {
-	function mb_strlen($s) {
-		return strlen($s);
+	function mb_strlen($s,$sEncode="UTF-8") {		
+		$length = strlen(iconv($sEncode, 'Windows-1251', $s));
+      	return (int)$length;
 	}
 }
 
+/**
+ * Если не стоит расширения mb
+ */
+if (!function_exists('mb_strtolower')) {
+	function mb_strtolower($s,$sEncode="UTF-8") {		
+		$s=iconv($sEncode,"Windows-1251",$s);
+		$s=strtolower($s);
+		$s=iconv("Windows-1251",$sEncode,$s);
+		return $s;
+	}
+}
 
 /**
  * функция вывода отладочных сообщений через "хакерскую" консоль Дмитрия Котерова