iFrame alternative for getting cross-domain URL
<p>I'm creating a web-based game. As a part of it, the player must go to the home page of a website, and follow a series of link until he reaches to the "destination page" in the minor time possible. Think of it as a sort of link treasure hunt.</p>

<p>In order to control the game, I created a page with a javascript timer on the top, and an iFrame showing the website to surf (which is not mine and I have no control over it). </p>

<p>However this has a huge fault: it is not possible to detect the current cross-domain URL of the iFrame, so my page cannot know when the user has arrived to the destination page and stop the game.</p>

<p>Is there any alternative way I could achieve this?</p>