How to render background image with an HDRI world bg?

[Mason_Dixon]

Hi, I’ve got my particle animation lit up the way I want with a nice HDRI world background in Cycles. But I’d like to have a different image as the background for the particle animation. I’m very new to nodes and could use a little extra detail in the setup if possible. This is what I’ve got so far, but not sure what to do next, thanks. Top nodes are for the background image, bottom is the HDRI setup.

[Roken]

This way: (I didn’t bother adding HDRIs)

[Mason_Dixon]

Perfect, Thanks!