<!DOCTYPE html>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>背景平铺</title>
<style>
#beijing{z-index:-999;display:block;position:absolute;top:0}
</style>
<script>
beijing.style.height=document.documentElement.clientHeight+10+"px";
</script>
</head>
<body>
<img id="beijing" src="style/images/bg.jpg" width="100%" height="810px" />
//height="810px" 高度是810 不够在加。
</body>
</html>
END
