Any Plugin: Resizes iFrame based-on browser window size? (not content size)

Any Plugin: Resizes iFrame based-on browser window size? (not content size)

Hi all,
Looking for a plugin that can resize an iFrame based-on the browser widow size, not the size of the content on the page.  If a user loads the page in a larger size, they will see more of the iFrame content.  If a user loads the page in a smaller size, they will see less of the iFrame content.  If it has the capability to resize after load if the user changes the size of said browser window, great, if not, that is fine as well.

Thanks!