js弹出层居中
<!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=gb2312" /><title>OpenBox</title></head><style type="text/css">body{font-size:14px;}.openbox_bg,.openbox{position:absolute; display:none;}.openbox_bg{left:0; top:0; background:#000; width:100%; height:100%; filter:alpha(opacity=60); opacity:0.6; z-index:99; }.openbox{top:50%; left:50%; margin:-180px 0 0 -350px; width:700px; height:360px; background:#FFF; z-index:100;}.openbox a{float:right; margin:5px 5px 0 0;}</style><script type="text/javascript">function G(id) { return document.getElementById(id);}function openbox(url) { G("openbox").style.display = "block"; G("openbox_bg").style.display = "block"; if (url != '') { G("openbox_iframe").src = url; }}function closebox() { G("openbox").style.display = "none"; G("openbox_bg").style.display = "none"; G("openbox_iframe").src = "about:blank";}</script><body><a href="#" mce_href="#" onclick="openbox('http://baidu.com')">打开弹出层</a><!-- openbox --><div id="openbox_bg" id="openbox"> <a href="#" mce_href="#" onclick="closebox()">关闭</a> <iframe id="openbox_iframe" width="100%" height="100%" frameborder="0" scrolling="no" src="about:blank"></iframe></div><!-- openbox end --></body></html>?