Singleton

var inViewTool = function () {
    var inViewToolName, names;
    return {
        setName: function ( s ) { return inViewToolName = s; },
        name: function ( ) { return inViewToolName; },
        setNames: function ( a ) { return names = a; },
        names: function (  ) { return names; },
        concatName: function ( n, m ) { return names[n] + ' ' + names[m]; }
    };
}();