Disable and Enable Multires on FullScreen

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.

<layer name="skin_btn_fs" style="skin_base|skin_glow" crop="0|576|64|64" align="bottom" x="140" y="4" scale="0.5" onclick="switch(fullscreen);" devices="fullscreensupport" />

This is my full screen button from the vtour skin. I will add functions beside the switch(fullscreen);

Also it is ok if we don't switch back to multires=false on escape from fullscreen.

Any thoughts? Any help will be appreciated.

Also if this is not possible then, anyway in which I can load the smaller pano fast, without going to higher resolution levels at all.

Or if I can set the small pano to load mobile version of the tiles.

Found Solution:

load low resolution pano in normal screen and high resolution pano in fullscreen

But unfortunately this does not work for HTML5