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<div id="backDiv" style="display:none;filter:alpha(opacity=50);opacity:0.5;-moz-opacity:0.5;position:fixed;_position:absolute;top:0;left:0;width:100%;height:100%;background:#fff;z-index:1;">
<iframe style="position:absolute;filter:alpha(opacity=0);opacity:0;-moz-opacity:0;left:0;top:0;width:100%;height:99%;"></iframe>
</div>
<div id="loginDiv" style="display:none;width:830px;height:470px;">
<h1>登录</h1>
<input type="button" value="close" onclick="close()" />
</div>
<script type="text/javascript">
var backDiv = document.getElementById("backDiv");
var loginDiv = document.getElementById("loginDiv");
window.onload = function() {
// 弹出登录页面
var wHeight = document.body.offsetHeight;
var wWidth = document.body.offsetWidth;
var top = (wHeight - parseInt(loginDiv.style.height, 10)) / 2;
var left = (wWidth - parseInt(loginDiv.style.width, 10)) / 2;
backDiv.style.display = "block";
backDiv.style.height = wHeight;
backDiv.style.width = wWidth;
backDiv.style.position = "absolute";
loginDiv.style.display = "block";
loginDiv.style.border = "#ccc 8px solid";
loginDiv.style.position = "absolute";
loginDiv.style.top = top + "px";
loginDiv.style.left = left + "px";
}
function close() {
backDiv.style.display = "none";
loginDiv.style.display = "none";
}
</script>