function openpopwin( url, h, w )
{
document.getElementById( "popwin" ).style.display = "block";
document.getElementById( "popwinback" ).style.display = "block";
document.getElementById("popwinweb").src = url;
document.getElementById( "popwin" ).style.top = ( document.documentElement.clientHeight - h ) / 2;
document.getElementById( "popwin" ).style.left = ( document.documentElement.clientWidth - w ) / 2;
document.getElementById( "popwin" ).style.height = h;
document.getElementById( "popwin" ).style.width = w;
document.getElementById("popwinweb").height = h;
document.getElementById("popwinweb").width = w;
document.getElementById( "popwinback" ).style.height = document.body.scrollHeight;
document.getElementById( "popwinback" ).style.width = document.body.scrollWidth;
}
// 关闭提示画面
function closepopwin()
{
document.getElementById( "popwin" ).style.display = "none";
document.getElementById( "popwinback" ).style.display = "none";
document.getElementById("popwinweb").src = "about:blank";
}
<div id="popwin" style="position: absolute; z-index: 100; display: none;">
<iframe id="popwinweb" name="popwinweb" frameborder="0"></iframe>
</div>
<div id="popwinback" style="position: absolute; z-index: 90; display: none; filter: Alpha(opacity=36);
height: 200%; width: 100%; top: 0; left: 0; overflow: hidden;">
<iframe name="popwinbackweb" style="height: 200%; width: 200%; top: -10%; left: -10%;"
onload="aboutblank();"></iframe>
</div>