Can javascript access iframe elements from the parent page?

I have iframe on a page, the iframe and the parent page are in different domain, can a javascript code on the parent page access elements inside this iframe?

It should not be able to if the pages are from different domains, the browsers security sandbox should prevent this type of access. It might work when the two pages are from different sub domains of the same domain, but that can and will differ between browsers (and possibly even versions of the same browser).

Accessing the child iframe might work, but the other way around will most certainly not work.

The easiest way would be through the frames object on window like this:

window.frames[0].document.getElementById('ElementId').style.backgroundColor="#000";

If the two domains are completely seperate then it is impossible

Use jQuery.postMessage plugin http://benalman.com/code/projects/jquery-postmessage/docs/files/jquery-ba-postmessage-js.html

Browsers Tested Internet Explorer 6-8, Firefox 3, Safari 3-4, Chrome, Opera 9.