用代码制作的图片交替显现

代码：<table height="600" cellpadding="0" width="900" background="图片地址" border="0"><tbody><tr class="firstRow"><td><div><marquee scrollamount="4" direction="down" width="900" height="600"><marquee scrollamount="4" direction="up" width="900" height="600"><img style="FILTER: alpha WIDTH: 900px; HEIGHT: 600px" height="600" alt="夕阳翁音画" src="图片地址" width="900"></marquee></marquee></div>