[jQuery] Trying to create a user name constructor

[jQuery] Trying to create a user name constructor


I am trying to create a form that when a user enters a user name into
a form field they are automatically shown what their email address
would look like. For example, if I were to type x12345 into the filed
I would be shown x12345@domainname.com. If possible I would like to
display several domain names simultaneously.
Any help would be greatly appreciated.