How to create a background movement effect?

Hi All,

I am trying to create an effect whereby the user will click a button and the background image will change based on the area the user is visiting. yes, this can easily be done with a trigger to show hide a layer, but I would like it to be like a sliding effect whereby it looks like the top content is actually animating/moving and not the background image. Think of it as a photoviewer effect.

Has anyone  done something like this? if so, can i see an example please? 

Thanks,

Karen

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