Function checkLimit

Picviewer CE+/Picviewer CE+.user.js:26409–26418

(e)

            };

            function checkLimit(e){
                if(e.button!=button ||
                   e.altKey!=alt ||
                   e.ctrlKey!=ctrl ||
                   e.shiftKey!=shift ||
                   e.metaKey!=meta){
                    return false;
                }
                return true;
            }

            function click(e){
                if(!checkLimit(e))return;