[grannyGrumpy]

I've just finished converting Huckleberry Finn, and the chapter headers are images. I want to link the headers back to the in-line TOC. This works fine in ADE, Calibre reader, and Sigil.
The links do NOT work on my Sony T2 touch-screen reader, or in Sony reader software on the desktop.

Is this a known issue? Do most readers support images-as-links, or do most of them fail? Are there CSS workarounds to get around the failures?

Any feedback will be gratefully appreciated, thanks.