Help with MIN field value

I need a single SELECT statement on FOO that returns the LOWEST date between the five fields.

So, if table records looked like

FOO:

F1	F2	F3	F4	F5
3/25/03	3/12/03	3/10/03	3/15/03	3/22/03
5/03/03	5/10/03	5/22/03	5/22/03	5/03/03
9/10/03	9/09/03	9/12/03	9/01/03	9/15/03

The select statement would return:

3/10/03
5/03/03
9/01/03

Again, this would need to work in a single select statement. If it is impossible, then if a stored procedure could be used, please show that.