function openwindow(url,name,iWidth,iHeight)
{
   var url;                                  //转向网页的地址;
   var name;                            //网页名称，可为空;
   var iWidth;                           //弹出窗口的宽度;
   var iHeight;                        //弹出窗口的高度;
   var iTop = (window.screen.availHeight-30-iHeight)/2;        //获得窗口的垂直位置;
   var iLeft = (window.screen.availWidth-10-iWidth)/2;           //获得窗口的水平位置;
   window.open(url,name,'height='+iHeight+',,innerHeight='+iHeight+',width='+iWidth+',innerWidth='+iWidth+',top='+iTop+',left='+iLeft+',toolbar=no,menubar=no,scrollbars=auto,resizeable=no,location=no,status=no');
}
openwindow('statement.html','',600,400);