Wordpress transfer to from an external (non-Wordpress page)

We have a situation where the customer has a new wordpress website & want's to use the on-line payment processing from the "old" (non-wordpress) site.

My thinking is to modify one of the menu items on the Wordpress site to refer to an absolute url on the old site to get to the payment page.

My question is "getting back".

What I would like to do is after payment processing is complete, have it return to the Wordpress site "main page" & show a Javascript like popup that says something like "Thank you for your payment" with a Close button (or just an X in the upper right).

Is there a generic way to do that without having to know the details of the specific theme, etc.?

Thanks
Richard KortsAsked:
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GaryCommented:
I would be hesitant transferring to a non recognised website for payments.
Why can they not just move the the payment processing to the new site.

As for going back just append the url with an hash that you main page can check on load with some js in the head and if set give the alert

if(location.hash=="paid"){
    alert("Thank you")
}
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Richard KortsAuthor Commented:
To Gary,

The existing payment page works & has been live for years, I'm not concerned about that. It uses Authorize.net, in my view one of the best at doing that.

By "hash" you mean like www.somesite.com/#paid?

I have done a little WordPress but I don't know how to insert custom Javascript into a WordPress page. Can you provide reference?
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GaryCommented:
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Jason C. LevineNo oneCommented:
You can absolutely move the "old" payment page into WordPress by simply taking the code and creating a custom page template for it:

http://codex.wordpress.org/Page_Templates#Custom_Page_Template

Simply create a new PHP file in the theme folder, name it page-payment.php or whatever, and follow the instructions in the Codex to add your own code.
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