弄了半天，终于好了，记录下来。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>三个div水平居中</title>
<style type="text/css">
body {
text-align:center;
margin:0;
}
#div0
{
border:solid 1px #000000;
}
#div0
{
width:1000px;
height:220px;
text-align:center;
margin:0 auto;
padding:0;
}
#div_left,#div_middle,#div_right
{
margin:0;
padding:0;
width:200px;
height:200px;
border: dotted 1px Red;
display:inline-block;
}
</style>
<!--[if lte IE 7]>
<style type="text/css" media="all">
#div_left,#div_middle,#div_right
{
display:inline;
}
</style>
<![endif]-->
</head>
<body>
<div id="div0">
<div id="div_left">div_left</div><div id="div_middle">div_middle</div><div id="div_right">div_right</div>
</div>
<br />
<!--<p>
lte:小于等于
gt:大于
gte:大于等于
</p>
-->
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>三个div水平居中</title>
<style type="text/css">
body {
text-align:center;
margin:0;
}
#div0
{
border:solid 1px #000000;
}
#div0
{
width:1000px;
height:220px;
text-align:center;
margin:0 auto;
padding:0;
}
#div_left,#div_middle,#div_right
{
margin:0;
padding:0;
width:200px;
height:200px;
border: dotted 1px Red;
display:inline-block;
}
</style>
<!--[if lte IE 7]>
<style type="text/css" media="all">
#div_left,#div_middle,#div_right
{
display:inline;
}
</style>
<![endif]-->
</head>
<body>
<div id="div0">
<div id="div_left">div_left</div><div id="div_middle">div_middle</div><div id="div_right">div_right</div>
</div>
<br />
<!--<p>
lte:小于等于
gt:大于
gte:大于等于
</p>
-->
</body>
</html>
