var redirecting = false;
        var fullScreenMode = false;

        function launchIntoFullscreen(element) {
            if(element.requestFullscreen) {
                element.requestFullscreen();
            } else if(element.mozRequestFullScreen) {
                element.mozRequestFullScreen();
            } else if(element.webkitRequestFullscreen) {
                element.webkitRequestFullscreen();
            } else if(element.msRequestFullscreen) {
                element.msRequestFullscreen();
            }
        }


        function exitFullscreen() {
            if(document.exitFullscreen) {
                document.exitFullscreen();
            } else if(document.mozCancelFullScreen) {
                document.mozCancelFullScreen();
            } else if(document.webkitExitFullscreen) {
                document.webkitExitFullscreen();
            }
        }
        $("#fullWidthBtn").on( "click", function(e){
            localStorage.setItem('viewer-full-width','full_width');
            if($('#main-container').hasClass('container')){
                element = $('#main-container');
                element.removeClass('container').addClass('container-fluid p-0');
            }
            $( "#fullWidthBtn" ).hide();
            $( "#adaptedBtn" ).show();
        });

        $("#adaptedBtn").on( "click", function(e){
            localStorage.setItem('viewer-full-width','adapted');
            if($('#main-container').hasClass('container-fluid')){
                element = $('#main-container');
                element.removeClass('container-fluid p-0').addClass('container');
            }
            $( "#adaptedBtn" ).hide();
            $( "#fullWidthBtn" ).show();
        });

        $("#separatedBtn").on( "click", function(e){
            localStorage.setItem('viewer-separation','separated');
            $('.viewer-img').each(function(i, obj) {
                if(!$(obj).hasClass('separated')){
                    $(obj).addClass('separated');
                }
            });
            $( "#separatedBtn" ).hide();
            $( "#notSeparatedBtn" ).show();
        });

        $("#notSeparatedBtn").on( "click", function(e){
            localStorage.setItem('viewer-separation','not_separated');
            $('.viewer-img').each(function(i, obj) {
                if($(obj).hasClass('separated')){
                    $(obj).removeClass('separated');
                }
            });
            $( "#notSeparatedBtn" ).hide();
            $( "#separatedBtn" ).show();
        });

        $( "#fullScreenBtn" ).on( "click", function(e){
            if(!fullScreenMode) {
                launchIntoFullscreen(document.documentElement);
            }else{
                exitFullscreen();
            }
            fullScreenMode = !fullScreenMode;
        });

        if (localStorage.getItem('viewer-separation')) {
            var viewer_separation = localStorage.getItem('viewer-separation');
            if(viewer_separation==="separated"){
                $( "#separatedBtn" ).trigger( "click" );
            }else{
                $( "#notSeparatedBtn" ).trigger( "click" );
            }
        }

        if (localStorage.getItem('viewer-full-width')) {
            var viewer_width = localStorage.getItem('viewer-full-width');
            if(viewer_width==="full_width"){
                $( "#fullWidthBtn" ).trigger( "click" );
            }else{
                $( "#adaptedBtn" ).trigger( "click" );
            }
        }