Resize iFrame which loads content from different domain

Hello, if you have a look to [login to view URL] you will see an aspx page which contains a forum (see from word "Info2000 Forum" and below). This forum is hosted on another web server which answers at this address [login to view URL] The integration is done using nothing more that iFrame following these directions: [login to view URL] If you see at bottom of the page, the forum page is truncated so the request is to find a way to resize the height of parent iFrame depending of forum page: at least at form load, if you also can also resize the iframe periodically let's say each 500ms, it would be better (this because user can expand or collapse forum sections). I spent a few of hours without getting good resuls: as you can see. A piece of code or fixing actual one is requested: up to you which solution to follow: jquery, html or whatever. If you need some information more feel free to contact me. Thank you.