iframe onclick event to refresh parent window

I have a php page that loads an iframe (which contains a contact form).  When the contact form is submitted, the response appears inside the iframe with a return button tied to an onclick event that I want to reload the parent window (which will reload the iframe, too - I want this to happen).  

The contact form's send button uses post to send the form data to another php, which sanitizes the data and sends me an email.  Inside this php is the code (below) which returns into the original iframe which gives a "thank you" or error message and presents a 'click to return' button.

Can't get the button to work generically, but it will work if I give it a specific URL.  Other simple javascripts, like alerts are working.  Again, in the parent.location.href, if I give it a specific URL, it works just fine.  I want, however, to use this on several different sites and want to point the parent.location.href to whatever page called it in the first place.

Here's the code:

In the body:
<script type="text/javascript" language="javascript">
function RefreshParent()
{
parent.location.href='http://www.mydomain.com';
}
</script>

inside php that processes the contact form and responds:

print "<p><input type=\"button\" value=\"Return\" onClick=\"RefreshParent();\"></p>";

So, the question is:

What can I replace
parent.location.href='http://www.mydomain.com';
with to refer to the page that originally loaded the iframe, without specifying a hardcoded URL?  


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