网站中有一段CSS是指banner的背景图为3.jpg
我想把它的背景图由jpg换为动态的swf动画，swf是我做的，尺寸和jpg一样
源代码：
.banner{ background:url(3.jpg) no-repeat center top; height:230px;} 怎样改为3.swf呢？
回复讨论(解决方案)
css不能放flash做背景的
可以加个层虚拟一个出来，效果一样，多写一个层让他浮动起来 position:absolute，设置他坐标为负数z-index:-1;效果就一样了
干嘛用FLASH做背景 还真没见过这种额
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