Facebook Page Tab Redirecting Repeatedly

Hi all.

I've been using FanGates for some time now and wanted to design something a ittle different and it involved writing an app that captured user data.

The problem I appear to be having is that I can direct a user to the app quite easily with the following code:

<script>
    var oauth_url = 'https://www.facebook.com/dialog/oauth/';
    oauth_url += '?client_id=XXXXXXXXXX';
    oauth_url += '&redirect_uri=' + encodeURIComponent('https://www.facebook.com/PageName/?sk=app_XXXXXXXXXX);
    oauth_url += '&scope=email'


    window.top.location = oauth_url;
</script>

Code (markup):

I am checking to see if the access token is set with this:

    if (empty($access_token))
    {

Code (markup):

And then triggering the code above.

However, it seems to go into a refresh cycle that simply does not stop.

I've tried forcing it to ask for a token on every load, no joy.

I know I haven't put much code up here but if someone is willing to help me work on this I would more than happily place the code in pastebin so we can review it together.

Basically, if I put this code in the header:

<script>    var oauth_url = 'https://www.facebook.com/dialog/oauth/';    oauth_url += '?client_id=XXXXXXXXXX';    oauth_url += '&redirect_uri=' + encodeURIComponent('https://www.facebook.com/PageName/?sk=app_XXXXXXXXXX);    oauth_url += '&scope=email'    window.top.location = oauth_url; [COLOR=#111111]</script>
[/COLOR]

Code (markup):

Then it displays the app and asks for permission. All good.

But once the user clicks "Go To App" it simply keeps refreshing the page.
Thanks in advance...