How can I run this MySQL 4 update statement in MySQL 3(syntax change):

UPDATE table1, table2
SET table1.field1 = table2.field1
WHERE table1.field2 = table2.field2;

Also if not possible, how I can use this sybase update statement in mysql 3:

UPDATE table1
SET field1 = t2.field1
FROM table1 t1, table2 t2
WHERE t1.field2 = t2.field1;