This is not working … I cannot stack those image place-holders on top of each other for my Roll-Over with Taget Show / Hide process, because I cannot select more than 1 item in the left column in Page view.
As stated in the FRW UG one should be able to select several items, which I cannot (and they are inline items.)
The best option is to create an inline HTML item, make it just a tad bigger than the rollover graphics, and stack the rollover graphics inside it as child elements (non-inline).