How can I override the OnBeforeUnload dialog and replace it with my own?

You can't modify the default dialogue for onbeforeunload so your best bet may be to work with it.

Owen is correct. And, the reason behind this is security. Preventing a page from unloading is useful in web forms and such, but it can easily be exploited by a malicious site to fool the user into staying on a page.

That's why web browsers implement the standard message and have this mechanism for inserting custom text.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.