Iframes and framesets work in essentially the same way so there's no point in trying framesets.
An iframe should work. The iframe has to be given a size; if this is insufficient it should create scrollbars, so that shouldn't be a problem if your content from another page is too big.
Whatever size of your white space is, set the iframe size smaller than this to test, if it doesn't disturb the rest of the page, gradually increase the iframe size.
Code downloaded to my PC will be deleted in due course.
WIN7; IE9, Firefox, Opera, Chrome and Safari for Windows; screen resolution usually 1366*768.
Also IE6 on W98 with 800*600 and IE8 on Vista 1440*900.