I have to add a small pano on a page and I need to disable multires for it.
And then when the user clicks on the fullscreen button, then he should be able to see the multires pano.
Multires means if you have a small screen you only get small images. It does exactly already what you are trying to do. If it doesn't work right, than you don't have the levels configured right. Just set everything back to auto.