I have an iframe on www.example.com that points to support.example.com (which is a CNAME to a foreign domain).
iframe
I automatically resize the height of my i
I just solved it on my blog with scrolling="no" after the style tag.
eg:
iframe src="asdf.html" style="overflow: hidden;" scrolling="no"
I left the style attribute in there because it's more proper and it worked fine on Firefox.