windows.open打开窗口并居中

function wopen(id)
{
  
       var iWidth = 950;                          //弹出窗口的宽度;
       var iHeight = 560;                         //弹出窗口的高度;
            
       //获得窗口的垂直位置
       var iTop = (window.screen.availHeight - 30 - iHeight) / 2;
       //获得窗口的水平位置
       var iLeft = (window.screen.availWidth - 10 - iWidth) / 2;
            
       var url = 'new.html?id='+id;
            
       window.open(url,'_blank','width=' + iWidth + ',height=' + iHeight + ',top=' + iTop + ',left=' + iLeft ',menubar=no,toolbar=no, status=no,scrollbars=yes')
            
 }