The circuit diagram in the PDF looks good. Nice and simple.

How do i know what value resistors to use? Do i stick with 130K as shown in the diagram? I would have thought it varies for each type of optoisolator. I tried to calculate it based on the maths from a site macrakit linked to Designing LED lighting. I worked out that for my opto isolator the resistors should be 3K975. I think ive gone wrong somewhere because i wouldnt have thought it would vary that much. Im using a MOC3020M.

I take it the diode is just to stop reverse voltage going into the optoisolator. Would it work the same if it was in series with it?

I think im missing some of the document. skimask mentioned page 77 but all i see is a single page with a short writeup and a link to a PDF file. I dont see any kind of navigation for multiple pages either