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<div id="main" style="text-align:center;background:url(Images/login.jpg) no-repeat center;height:100%; width:100%">
<div id="div1" style="width: 350px;">
<table border="0" style="height:100%;width:100%">
<tr>
<td align="center" valign="middle">
<ul>
<li>登录账号 <input id="Text1" name="login_id" type="text" onkeydown="if(event.keyCode==13)event.keyCode=9;" style="width:160px;" /></li>
<li></li>
<li>登录密码 <input id="Password1" name="login_pw" type="password" onkeydown="if(event.keyCode==13){document.getElementById('Button1').click();return false;}" style="width:160px" /></li>
<li></li>
<li style="text-align:left;margin:10px 0 0 20%;">
<input id="Button1" type="button" runat="server" value="登 录" onserverclick="Button1_Click" onclick="if(button())"/>
<input id="Button2" type="button" value="重 置" style="margin:0 0 0 10%;" /></li>
</ul>
</td>
</tr>
</table>
</div>
</div>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
<style type="text/css">
html, body
{
height: 100%;
overflow: auto;
}
body
{
padding: 0;
margin: 0;
}
</style>
</head>
<body>
<form id="form1" runat="server" style="height: 100%">
<table border="0" cellpadding="0" cellspacing="0" width="100" style="height: 100%; width: 100%;">
<tr>
<td align="center" valign="middle">
<div style="width:350px;">
垂直水平居中
</div>
</td>
</tr>
</table>
</form>
</body>
</html>
<!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">
<style>
html,body{height:100%}
</style>
<body>
<div id="main" style="height:100%; width:100%;background:green">
<div id="div1" style="width: 350px;margin:auto;height:100%; background:Red">
<table border="1" style="height:100%;width:100%">
<tr>
<td align="center" valign="middle">
<ul>
<li>登录账号 <input id="Text1" name="login_id" type="text" onkeydown="if(event.keyCode==13)event.keyCode=9;" style="width:160px;" /></li>
<li></li>
<li>登录密码 <input id="Password1" name="login_pw" type="password" onkeydown="if(event.keyCode==13){document.getElementById('Button1').click();return false;}" style="width:160px" /></li>
<li></li>
<li style="text-align:left;margin:10px 0 0 20%;">
<input id="Button1" type="button" runat="server" value="登 录" onserverclick="Button1_Click" onclick="if(button())"/>
<input id="Button2" type="button" value="重 置" style="margin:0 0 0 10%;" /></li>
</ul>
</td>
</tr>
</table>
</div>
</div>