Help me with this "pop up" scenario, please...

The scenario :
1. I've made 1 div "pop up" that hidden.
2. When visitor leaving my page or click on link to other sites, div "pop up" set to visible asking visitor to leave or visiting another page that I've set before
3. When div "pop up" appear, all process "paused". Similar when in javacript, its will pause all event and then continue when user click OK button.

My problem is at point 3. If I've try to use , the process still continue. Can anyone help me?

Thank

I don't know of anyone who has figured this out, mostly because browser standards are developed to prevent a website from preventing exit of the browser.