I used this one:
http://hosting.gmodules.com/ig/gadgets/file/117808631063490062819/url.xmlSince I have an ordinary 4:3 monitor at a max resolution of 1280x1024, I usually set the iFrame size to 1024x768. I never got any second scrollbar, but the iFrame might look funny on widescreen displays, but if I were to increase the iFrame, it might appear strange on regular (4:3) monitors. You could set the iFrame to, say, 1600x1200, but since my monitor doesn't have that resolution, it went off-screen. Maybe it would help for you.
If my process helped or worked out better for you, just reply. I hope this helped.