Thanks Gramps, this has got me started.
I made a copy of an existing page and added a test menu from my new Dreamweaver 5.5, which presumably uses the latest version of Spry, above the old menu. I added pictures/links to the first item.
All links of course go to the unmodified pages of the existing site (same without the b)
Everything works fine in a regular browser, as it did before.
On an iPad, once you have clicked a couple of times on the new menu (#2) items, the sub menus start appearing, including the pictures in the first item, though no amount of clicking on just the first item gets things started, so it wouldn't work if I continued to add all the pictures/links. If I remove the link under the very first button I can force it to show the sub menu pictures but I don't think I should do this.
I am making progress but not quite there. Can you help me?