CSS-多重背景图像

嘿.我想在css的不同位置放置多个背景图像(比如diff px.和diff z-index.)
这在身体标签中是否可行.我是指身体标签中的所有图像.或者有差异.？

body    {BACkground-image:url(img/bAnner.png);
     BACkground-position: 50% 49px;
     BACkground-repeat:no-repeat;
     BACkground-color:#000000}

.nav {position:absolute;
top:267px;
left:149px;
z-index:1}

.home   {position:absolute;
     top:281px;
     left:285px;
     z-index:2;}

.event  {position:absolute;
     top:281px;
     left:389px;
     z-index:2;}

.sponsors{position:absolute;
     top:281px;
     left:493px;
     z-index:2;}

.about  {position:absolute;
     top:281px;
     left:597px;
     z-index:2;}

.register{position:absolute;
     top:281px;
     left:701px;
     z-index:2;}

.more   {position:absolute;
     top:281px;
     left:805px;
     z-index:2;}

.box    {position:absolute;
     top:1163px;
     left:157px;
     z-index:1;}

并为每个类我想添加一个背景图像.
请更正代码.并在上面的所有条目中添加背景图像

BACkground: url(body-top.gif) top left no-repeat,url(bAnner_fresco.jpg) top 11px no-repeat,url(body-bottom.gif) bottom left no-repeat,url(body-middle.gif) left repeat-y;