On my news manager I'm developing I want the client to be able to add a news story of their own, or link externally to one.
I want to have a checkbox that they can select if they want it to link to an external news item. If they do not select the checkbox I'd like the value for news_external to be set to 0, if they do select the checkbox I'd like the value for news_external to be set to 1.
How can I do this?