Over-riding JavaScript Confirm Box. on onbeforeUnload

After searching for a long time I was able to find a method to
override the confirm box contents using jqModal.
This works when we invoke a confirmation
using the onclick ,href or other such events.

I need to know how to over-ride the confirmation box that
pops when we use the onbeforeunload event using this jqmodal.

I need to replace the confirmation box that pops when using the
onbeforeunload event with the new confirm box from jqmodal

Please Help.

 

I'm trying to stop the box from popping up

 

look for the function the button executes the onclick event.. maybe you can find what you need.

if your just modifying the look, you can just do that by css

 

Is there and html or codes that you know that would help?