Need help with onBeforeUnload

Hello,

I'm having some difficulty accomplishing what I want. I want to redirect a user if they choose to close their browser window or keep them on the same page if they do not. The page in question is a frameset.

Here is the script I have so far, which is not workinng. The window will simply close.

<script>

window.onBeforeUnload = DoLogout

function DoLogout(){
if(confirm("Are you sure you want to leave?")) {
window.navigate("default.asp?logout=yes")
}
else {
window.open("admin_home.asp")
}
}


</script>

Can someone please point me in the right direction? I'd really appreciate some help!

TIA,
Brandon

Why?

If I want to leave or close the browser, what business do you have trying to stop me. Besides, onBeforeUnload is IE proprietary.