added reconnect() method to db drivers
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index ddc036d..241b280 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -82,7 +82,23 @@
 	}
 	
 	// --------------------------------------------------------------------
+	
+	/**
+	 * Reconnect
+	 *
+	 * Keep / reestablish the db connection if no queries have been
+	 * sent for a length of time exceeding the server's idle timeout
+	 *
+	 * @access	public
+	 * @return	void
+	 */
+	function reconnect()
+	{
+		// not implemented in MSSQL
+	}
 
+	// --------------------------------------------------------------------
+	
 	/**
 	 * Select the database
 	 *