Originally Posted by Jellby
... and if you want the text in the NCX file to be different than in the XHTML, you can use the title attribute. This works for images too:
<h3 title="1. The Beginning"
>Chapter 1: The Beginning</h3>
<h3 title="Chapter X"
><img src="chapter-10.jpg" alt="chapter 10"/></h3>
or so I believe, since I don't use Sigil
100% correct (with the Image wrapped in a h tag as shown)