弹出窗口居中显示

弹出窗口居中显示
<input type=button value=test onclick='window.open("about:blank","","width=200 height=200 left="+(screen.availWidth-200)/2+" top="+(screen.availHeight-200)/2)'>

<a href="#" onclick="window.open('admin/ModifyPwd.jsp','','width=400,height=300,left='+(screen.availWidth-600)/2+' ,top='+(screen.availHeight-500)/2);">弹出窗口并居中显示</a>

文本框(input)内容向右显示：代码如下:<input type="text"  style="text-align: right"/>

弹出窗口居中显示