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diff --git a/includes/db/sql_functions.inc b/includes/db/sql_functions.inc
index b869f6bd..85a25137 100644
--- a/includes/db/sql_functions.inc
+++ b/includes/db/sql_functions.inc
@@ -9,21 +9,54 @@
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
     See the License here <http://www.gnu.org/licenses/gpl-3.0.html>.
 ***********************************************************************/
+//
+//	General database functions common for all modules.
+//
 //-------------------------------------------------------------------
+// Multilevel transaction control.
+//
 
 function begin_transaction()
 {
-	db_query("BEGIN", "could not start a transaction");
+	global $transaction_level; // set in set_global_connection()
+
+	if (!$transaction_level) {
+		db_query("BEGIN", "could not start a transaction");
+	}
+	$transaction_level++;
 }
 
 function commit_transaction()
 {
-	db_query("COMMIT", "could not commit a transaction");
+	global $transaction_level;
+
+	$transaction_level--;
+
+	if (!$transaction_level) {
+		db_query("COMMIT", "could not commit a transaction");
+	}
 }
 
+/*
+	This function is called on end of script execution to cancel
+	all aborted transactions (if any)
+*/
 function cancel_transaction()
 {
-	db_query("ROLLBACK", "could not cancel a transaction");	
+	global $transaction_level;
+
+	if ($transaction_level) {
+		db_query("ROLLBACK", "could not cancel a transaction");	
+	}
 }
 
+//-----------------------------------------------------------------------------
+//	Update record activity status.
+//
+function update_record_status($id, $status, $table, $key) {
+	$sql = "UPDATE ".TB_PREF.$table." SET inactive = "
+		. db_escape($status)." WHERE $key=".db_escape($id);
+		
+  	db_query($sql, "Can't update record status");
+}
 ?>