When a site employs a 'frame within a page' you need to use the iPad's two-finger scroll and, instead of trying to scroll with a single finger, which moves the entire page, use two fingers instead, which will just scroll the embedded frame. I use my first and second finger and touch the area I want to scroll and drag with both fingers at once, either vertically or horizontally. It takes a bit of practice to get it right, but it soon becomes second nature.
Tim