In the familysearch.org website now you can view such things as testamentos, escrituras online. You click on the link such as testamentos, the scroll down to see the list and dates. On the far hand right there will be a camera symbol that you click on and you are taken right to the documents:
https://familysearch.org/search/catalog/results?count=20&query=%2Bautho…
Online Viewing
The "padrones" of Jalisco and some history/genealogy books are also available for online viewing.
Have you been able to locate a will of one of your ancestors in those films? I've browsed a few of those films, but I'm not sure where to start.