function d1_toggle(Appear) {
         Effect.toggle('d1','slide'),Effect.Fade('d2','fade'),Effect.Fade('d3','fade'),Effect.Fade('d4','fade');}
function d2_toggle(Appear) {
         Effect.toggle('d2','appear'),Effect.Fade('d1','fade'),Effect.Fade('d3','fade'),Effect.Fade('d4','fade');}
function d3_toggle(Appear) {
         Effect.toggle('d3','appear'),Effect.Fade('d1','fade'),Effect.Fade('d2','fade'),Effect.Fade('d4','fade');}
function d4_toggle(Appear) {
         Effect.toggle('d4','appear'),Effect.Fade('d1','fade'),Effect.Fade('d3','fade'),Effect.Fade('d2','fade');}
function d_close(Fade) {
         Effect.Fade('d1','Fade'),Effect.Fade('d2','fade'),Effect.Fade('d3','fade');
}
function top_fades(Appear) {
				  Effect.Appear('top1',{delay:0.0, duration:5.0}),
				  Effect.Appear('top2',{delay:10.0, duration:5.0}),
				  Effect.Appear('top3',{delay:20.0, duration:5.0}),
				  Effect.Appear('top4',{delay:30.0, duration:5.0});}