The situation:
Site abc is gives def an iframe (or a div, or whatever will make the last part work).
The iframe is pulling content from abc
The iframe cuts off the content because def has set a too-small height.
abc wants to control the height of the iframe.
Is this possible with the restrictions on JS?
If both parent and frame pages are in the same domain, you can cross script. if they are on different domains, most browsers will restrict this.