Cross Domain IFrame is not traversing

JavaScript code is not traversing via Iframe with Cross Domain.

Actually i was assigned with a project, to grab the top page URL, which has many Iframes, which are coming from different domains. The final sub domain has the JavaScript code, which has to grab the top page URL.

Can anyone help me out in this????

No code, no help.

No. You are wrong. I made it. But it is not working in some browsers alone. And i think i can overcome this by writing some browser scripting languages.

I think its high priority to me, so that i'm posting this. If it is just another post with no information to you means, don't try to reply that. Mind your business.