Delete record if user closes browser

I'm working on a script that adds information to a customer order throughout a series of several pages... At the bottom of each page, I've placed a cancel button that triggers this script:

function confirmCancel() {
var x=confirm("Cancel your order?");
if (x) {
document.location.href = "cancelorder.php";
}
}

...redirecting the user through a script that clears the session & deletes the database record.

If the user opts to close the browser... is there a way to make the script execute & redirect to the cancel order page before the browser closes?

Thanks for any help, ideas, suggestions, wisdom, etc!!!

I don't think you can add any function to the browser's close button. My suggestion is to use a method kinda timeout. Hard to explain when I'm not sure what your project really looks like.