window.onload?=?function(){
		var?g?=?function(idx)?{
			return?document.getElementById(idx);
		}
		var?container?=?g('container'),
			list?=?g('list'),
			buttons?=?g('buttons').getElementsByTagName('span'),
			prev?=?g('prev'),
			next?=?g('next'),
			index?=?1;

		function?showBtn()?{
			var?i?=?0,
				len?=?buttons.length;
			for(;i<len;)?{
				if(buttons[i].className?==?'on')?{
					buttons[i].className?=?'';
				}
				i++;
			}
			buttons[index?-?1].className?=?'on';
		}
		function?animate(offset)?{
			var?newLeft?=?parseInt(list.style.left)?+?offset;
			list.style.left?=?newLeft?+?'px';
			if(newLeft?>?-600)?{
				list.style.left?=?-3000?+?'px';
			}
			if(newLeft?<?-3000)?{
				list.style.left?=?-600?+?'px';
			}
		}
		next.onclick?=?function?()?{
			if(index?>=?buttons.length)?{
				index?=?1;
			}?else?{
				index?+=?1
			}
			animate(-600);
			showBtn();
			//list.style.left?=?parseInt(list.style.left)?-?600?+?'px';
		}
		prev.onclick?=?function(){
			if(index?<=?1)?{
				index?=?buttons.length;
			}?else?{
				index?-=?1;
			}
			animate(600);
			showBtn();
			//list.style.left?=?parseInt(list.style.left)?+?600?+?'px';
		}
	}

看看代碼有沒有打錯(cuò)