Button on the navigation bar below

Hello everyone, I want to achieve when the navigation buttons below to switch views to complete some of the features, ask what to do? That is, before loading a new view,
The key is to find the following ways? Or how to accomplish? Thank you! ! !
Reply:
I go again! ! !
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The reply was deleted at the moderator 2011-01-12 13:19:11

Reply:
Nobody ignores ah!