While clickable images may help in certain cases, what about assessing whether rollover images help or hurt SEO? The rollover will be placed on an image to give a ‘next continued step’
The rolloever is not as deliberate an act, of course, as a clickable image that leads to another graphic. Though not to the extreme of the popunder anyway.
I assume you mean the rollover will be done with Javascript in which case it will not be seen.
Even so, the act of hovering over an image is a behavior SE do not do.
Using javascript to create rollover images will not hurt your rankings. Google will even follow links within javascript but I still recommend using the traditional <a> tag.