js让弹出新窗口居中显示的脚本

<script language=javascript> <!-- function MM_openBrWindow( url, winName, width, height) { xposition=0; yposition=0; if ((parseInt(navigator.appVersion) >= 4 )) { xposition = (screen.width - width) / 2; yposition = (screen.height - height) / 2; } theproperty= "width=" + width + "," + "height=" + height + "," + "location=0," + "menubar=0," + "resizable=1," + "scrollbars=0," + "status=0," + "titlebar=0," + "toolbar=0," + "hotkeys=0," + "screenx=" + xposition + "," //仅适用于Netscape + "screeny=" + yposition + "," //仅适用于Netscape + "left=" + xposition + "," //IE + "top=" + yposition; //IE window.open( url,winName,theproperty ); } //--> </script> <a onClick="MM_openBrWindow('//www.qb5200.com','','width=420,height=390')">点击新窗口</a>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]