var alpha = [1, 2, 3, 4], beta = [1,2,3];
        var arrayIntersect = function(a, b)
        {
            return $.merge($.grep(a, function(i)
                {
                    return $.inArray(i, b) == -1;
                }) , $.grep(b, function(i)
                {
                    return $.inArray(i, a) == -1;
                })
            );
        };

        window.console && console.log(  arrayIntersect(alpha, beta) );