function wopen(url,name, w, h)
{
  w += 0;
  h += 0;
  wleft = (screen.width - w) / 2;
  wtop = (screen.height - h) / 2;
  if (wleft < 0) {
    w = screen.width;
    wleft = 0;
  }
  if (wtop < 0) {
    h = screen.height;
    wtop = 0;
  }
  var win = window.open(url,
    name,
    'width=' + w + ', height=' + h + ', ' +
    'left=' + wleft + ', top=' + wtop + ', ' +
    'location=no, menubar=no, ' +
    'status=no, toolbar=no, scrollbars=yes, resizable=no');
  if(navigator.userAgent.indexOf('MSIE 7')>0) 
  {win.resizeTo(w+20, h+50);}
  else
  {win.resizeTo(w, h+20);}

  win.moveTo(wleft, wtop);
  //win.focus();
}