Calling a parent window function from an iframe

Question

I want to call a parent window JavaScript function from an iframe.

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Answer 1

The solution given by Ash Clarke for subdomains works great, but please note that you need to include the document.domain = "mydomain.com"; in both the head of the iframe page and the head of the parent page, as stated in the link same origin policy checks

An important extension to the same origin policy implemented for JavaScript DOM access (but not for most of the other flavors of same-origin checks) is that two sites sharing a common top-level domain may opt to communicate despite failing the "same host" check by mutually setting their respective document.domain DOM property to the same qualified, right-hand fragment of their current host name. For example, if http://en.example.com/ and http://fr.example.com/ both set document.domain to "example.com", they would be from that point on considered same-origin for the purpose of DOM manipulation.