Cross site scripting on the same domain, different sub domains

Question

I have an iframe I'm using to pull in some content hosted by a 3rd party vendor to our website. We are trying to determine the height of that content to adjust the iframe height but I'm getting cross site scripting errors. I wasn't aware that sub-domains count as a cross-site. Is there some way around this without having to keep them on matching sub-domains?

For reference, our weekly marketing is hosted by the 3rd party vendor in flash but with the sub-domain we can redirect to them while keeping the user on our domains for cookie purposes.

Answer 1

From one of your subdomains, you can (with some exceptions) set the domain to allow broader access to other subdomains in the same main domain.

Take a look at this page: http://www.tomhoppe.com/index.php/2008/03/cross-sub-domain-javascript-ajax-iframe-etc/

Answer 2

Also take a look at cross window messaging