Click image open html5 video in lity

[amp3rsand]

Hi I am trying to set up where I can click an image and have the lightbox open and play a video. I can't seem to find what attributes to place where to link these two things up.

Dev site here:http://dev.amp-development.co.uk/commercials.html

When you click one of those images I have hidden videos in the inside the li tag that I'd like to show when they click the associated image..

right now when you click the first image (its only hooked up to the 1st image ATM) it just shows the same image. What I want to display in the lightbox is the hidden video.

thanks - &.