var divs_to_fade = new Array('box-1', 'box-2', 'box-3', 'box-4' ,'box-5' ,'box-6' ,'box-7');
        function swapFade(i,j) {
                Effect.Fade(divs_to_fade[i], { duration:1, from:1.0, to:0.0 });
                Effect.Appear(divs_to_fade[j], { duration:1, from:0.0, to:1.0 });
        }