message window triggered by browser back / window close

Im a php developer interested in going a little more client side. I nee开发者_运维知识库d to find a way to create some kind of dialogue when either the browser back or window close buttons are hit. Can you give me an idea of the best way to go about this.

Many thanks Giles

Here's a good place to start: https://developer.mozilla.org/en/DOM/window.onunload.

I think you want the 'onbeforeunload' event, or 'onunload'.

Some discussion here

For a dialog, I would look at the dialog widget from Jquery UI.