XF 2.1 change page width using toggle-storage

[shqawe]

I'm trying to change page width by adding anchor in footer once you click on it the page width will change like this site

Pixel Exit XF2 Demo

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pixelexit.com

I made this jquery code to toggle the page but once i refresh the page it doesn't save the change

<xf:js>
$(function(){
    $('.change_width').on('click', function() {
        $('.p-body-inner').toggleClass('change_board_with');
        $('.p-footer-inner').toggleClass('change_board_with');
        $('.p-nav-inner').toggleClass('change_board_with');
        return false;
    });
});
</xf:js>

what actually i need is how i change [pageWidthMax] style property value when page toggled like above site ?

Thanks in advance

 

[mysimsek]

yes this is required on me