以下代码复制粘贴即可使用:
示例一:
<!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 charset="gb2312" />
<style type="text/css">
.page_center {
width:100%;
}
#nav {
background-color:red;
height:20px;
}
#left {
width:120px;
background-color:green;
position:absolute;
}
#middle {
background-color:yellow;
}
#right {
width:120px;
background-color:green;
position:absolute;
top:0;
right:0;
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