Help with an exit pop-up! Doesn't work?

Hello,

I have a product that I am selling, and when someone tries to leave the page, I would for a pop-up to appear asking if they'd like a discount.

I have obtained the code to do this at, and put it right before the </head> tag.

Here's what the JavaScript looks like....

<script type="text/javascript" language="javascript">
<!--
var ShowExitPopup = true;
function ExitPage() {
	if (ShowExitPopup) {
		ShowExitPopup = false;
		location.href = "friendsandfamily.html";
		return '\n*************************************************\nTodays Special One Time Discount\n*************************************************\n\nWait... Before You Go:\n\nHave a look at this speacial offer, I normally use just for my freinds and family.\n\nToday  Im going to let you have complete access to the XXXXXXX for just $19.97 thats OVER HALF OFF the normal price.\n\nCLICK the CANCEL button below and automatically get your exclusive discount.\n\nThis is a limited TIME offer and may not be here tomorrow. Get Your Access NOW for Just $19.97.To use this One Time discount code simply click on the cancel button below.\n\n*************************************************\nTodays Special One Time Discount\n*************************************************\n';
	}
}
-->
</script>

Code (markup):

When I try to leave my site, the pop-up does not appear. It just closes like normal. I want it to have an exit pop-up like you see at myprofitsource.com.

If you know how to fix this, please let me know! If you send me a PM I will give you the web address to the site I have the code on so you can check it out.

$5 via PayPal to whoever can help me solve this problem.

 

Hey, this code works :

<script type="text/javascript" language="javascript">
<!--
window.onbeforeunload = show_message;
function show_message()
{
	msg = "\n*************************************************\nTodays Special One Time Discount\n*************************************************\n\nWait... Before You Go:\n\nHave a look at this speacial offer, I normally use just for my freinds and family.\n\nToday  Im going to let you have complete access to the XXXXXXX for just $19.97 thats OVER HALF OFF the normal price.\n\nCLICK the CANCEL button below and automatically get your exclusive discount.\n\nThis is a limited TIME offer and may not be here tomorrow. Get Your Access NOW for Just $19.97.To use this One Time discount code simply click on the cancel button below.\n\n*************************************************\nTodays Special One Time Discount\n*************************************************\n";
	return msg;
}
-->
</script>

HTML: