代码<!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=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
function loadmsg()
{
document.getElementById("msgid").style.top=
document.documentElement.scrollTop+(document.documentElement.clientHeight-document.getElementById("msgid").offsetHeight)/2+"px"
document.getElementById("msgid").style.left=document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("msgid").offsetWidth+"px";
}
window.onscroll=loadmsg;
window.onresize=loadmsg;
window.onload=loadmsg;
</script>
</head>
<body>
<div style="height:1500px; 1500px;">
<div style="height:200px;position:absolute" id="msgid"><script type='text/javascript' charset='utf-8' src='checkinform.js'></script><form action='' method='post' name='inform' id='inform' onsubmit='return checkinform();'><input type='hidden' name='record_type' value='104' /><input type='hidden' name='Refer_url' value='m.huadong.cn/index.html'/>姓名：<input name='namex' type='text' id='name' class='input' />手机：<input name='mobile' type='text' id='mobile' class='input' /><input name="Submit" type="image" value="submit_code" src="images/sq.jpg" alt="免费索取资料" class="input2"/ ></form></div>
</div>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
function loadmsg()
{
document.getElementById("msgid").style.top=
document.documentElement.scrollTop+(document.documentElement.clientHeight-document.getElementById("msgid").offsetHeight)/2+"px"
document.getElementById("msgid").style.left=document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("msgid").offsetWidth+"px";
}
window.onscroll=loadmsg;
window.onresize=loadmsg;
window.onload=loadmsg;
</script>
</head>
<body>
<div style="height:1500px; 1500px;">
<div style="height:200px;position:absolute" id="msgid"><script type='text/javascript' charset='utf-8' src='checkinform.js'></script><form action='' method='post' name='inform' id='inform' onsubmit='return checkinform();'><input type='hidden' name='record_type' value='104' /><input type='hidden' name='Refer_url' value='m.huadong.cn/index.html'/>姓名：<input name='namex' type='text' id='name' class='input' />手机：<input name='mobile' type='text' id='mobile' class='input' /><input name="Submit" type="image" value="submit_code" src="images/sq.jpg" alt="免费索取资料" class="input2"/ ></form></div>
</div>
</body>
</html>