YUI: Personalizing the message displayed in the browser when cancelling a window close event

I am working on a YUI application that requires me to notify the user before closing the window in certain situations. To achieve this, I have implemented a function to capture the window close event:

onWindowClose: function(e) {
        if (...)
        {
            YAHOO.util.Event.preventDefault(e);
        }
    }

When the user tries to close the window, the browser displays a standard message asking "Are you sure you want to navigate away from this page? Press OK to continue, cancel to stay on the current page". Is there a way for me to customize this message?

javascriptajaxcross-browseryui

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