I think JavaScript is the only way to do what you want. You can find something useful on stackoverflow:

http://stackoverflow.com/questions/1631959/browser-window-close-event#1632004
Hello all,

I would like to know if there is a way to open a popup window just before
the user tries to exit the browser window?

I tried using the "onbeforeunload" event on the body tag and managed to get
a prompt message that enables me to go back to the page i tried to exit.

Do you know a better solution?

Thanks
Rebecca

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