Just found this,
HideBckgImg – hide all visible / show all invisible background images.
script:var images = moi.view.getBackgroundImages(); for ( var i = 0; i < images.length; ++i ) images.item(i).hidden = !images.item(i).hidden;

but if for example i have one image hiden, for example back of the car, I dont want to show it when I hide all images. Just will be good to have script that make transparency 0 or (100 or 80)