请问如何将一个窗口至于显示器中央?

一个只包含一个div的窗口, 想调整它的大小和div的大小一样, 然后将其至于显示器中央, 应该怎么写这段javascript
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简单一点的可以:

1<script language="JavaScript">   
2function CenterScreen(url){   
3window.open(url,"","top="+(screen.availHeight/2-200)+",left="+(screen.availWidth/2-200)+",width=400,height=400")   
4}   
5</script>
1<a href="#" onclick="CenterScreen('add.htm')">Open a center page.</a>
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