We are using basic programing with xhtml and css to make an interactive epub book for the ipad. We are not using ibookauthor.

We want to have a button that will pop up a new window or frame on the page if it is clicked. This window could have a new photo or text in it. We are following the directions in apple's epub guide 4.8 that indicated to use ontouchstart. But our epub book fails the epubcheck for this feature.

Epubcheck flags this as "ontouchstart not allowed here". Is this a false positive on epubcheck? If not, what coding can we use to get new popup windows in ibooks and still pass the epubcheck?

DRK5