I use window.onbeforeunload i have my own custom alert message but along with my message some default message is also showing in that confirm window. I need only my custom message.
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there is no way you can do that. it's default functionality of browser.

rahul
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Thanks Rahul,But there is any other function that i want to used as a custom message alone.And also i want to know were is Window.onunload function it is in any js file? – user1648060 Nov 26 '12 at 07:40