CSS里使BODY的背景图片固定不动内容滚动

CSS里使BODY的背景图片固定不动内容滚动：style="background-attachment: fixed"

例子解析：

body {
 background-image: url(images/dbg.jpg);
 background-repeat: no-repeat;
 font-family: "宋体";
 font-size: 12px;
 line-height: normal;
 font-weight: normal;
 color: #FFFFFF;
 background-attachment: fixed;
}