var adiframe = "/demo.htm";

document.writeln('<div id="mainbox" style="z-index:1001;left:0;bottom:0; height:90px;width:200px;overflow:hidden;position:fixed;_position:absolute; _margin-top:expression(document.documentElement.clientHeight-this.style.pixelHeight+document.documentElement.scrollTop);">');
document.writeln('<a style="width:12px;heigh:12px;margin:5px 0 0 180px;line-height:12px;position:absolute;cursor:pointer;z-index:10;text-decoration:none;" title="关闭" onclick="javascript:document.getElementById(\'mainbox\').style.display=\'none\';">　</a><iframe src="'+adiframe+'" width="200" height="90" frameborder="no" border="0" marginwidth="0" marginheight="0" scrolling="no"allowtransparency="true"></iframe>');
document.writeln("</div>");