Tearing my hair out trying to create a simple index
 

I'm creating an ebook for my personal use and I wanted to create a simple index. I got the idea from Osnova's Direct Verse Jump.

So, as an experiment, I label the first two items:
<p.....><idx:entry><idx:orth>1</idx:orth></idx:entry>Blah blah.....</p>
<p.....><idx:entry><idx:orth>2</idx:orth></idx:entry>Blah blah.....</p>

I create the .prc file with Mobi Pocket Creator and it has an index, but it only lists the first index item.

I'm not trying to create a dictionary or do anything fancy, I just want an index so I can easily jump around in the book.

Update: I added a third <idx... set of tags and now the first two items appear in the index. Am I closing the <idx:entry> tag incorrectly?

Any ideas?

Thanks,
David