how to create foreign key between two tables

Check this website
 
http://blog.sqlauthority.com/2008/09/08/sql-server-%E2%80%93-2008-creating-primary-key-foreign-key-and-default-constraint/[^]

Create table1
create table2
alter table and add foriegn keys to any of the table you like
 
how to create and alter foreign keys, read following
http://msdn.microsoft.com/en-us/library/ms177463(v=sql.90).aspx[^]