Table schema:
CREATE TABLE table_2818164_7 (original_air_date VARCHAR, written_by VARCHAR, directed_by VARCHAR)

Question: What is the original air date the was written by mark st. germain and direct by jay sandrich?
SQL: SELECT original_air_date FROM table_2818164_7 WHERE written_by = "Mark St. Germain" AND directed_by = "Jay Sandrich"