To display region on a click of a button

hi,
I want to display a region on a click of a button which is in another region.I want when i click that button region containing button should get disappear and another region should get appear.when next time i open that page
region containing button should appear first.
second, i want to insert a check constraint on a field called mailid,that at time of inserting data in it ,it should contain '@'sign,if not a message should get displayed.
pls can u help in out.

Mak,
To show and hide your regions, you need to use conditions, please review the following section in the HTML DB documentation for information on how to do work with conditions:
http://download-west.oracle.com/docs/cd/B12037_01/appdev.101/b10992/mvl_a_con.htm#sthref1724
To validate your mail ID you could work with database constraints. However in order to customize your error message, I'd recommend using HTML DB validations, see the HTML DB documentation, chapter 7 for more information on how to work with validations:
http://download-west.oracle.com/docs/cd/B12037_01/appdev.101/b10992/mvl_buildr.htm#sthref938
Regards,
Marc

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