I made a test page for loading images and placing them on a web page using iFrames. Unfortunately, when I transferred the code to a real web page, the iFrame does not scroll with the page as the page is scrolled.

Here is the page I am working on:

To see the image just click on either the word "One" or "Two" on the left side of the page.

How do I get the iFrame to scroll with the page?

Or, is there a better way of viewing different images on a web page when clicking on a link?