function popup() {
  var popupWidth = 445;
  var popupHeight = 445;

  var winLeft = (screen.width - popupWidth) / 2;
  var winTop = (screen.height - popupHeight) / 2;
  remote=window.open("","popup","toolbar=0,scrollbars=yes,location=0,statusbar=0,menubar=0,resizable=0,width="+popupWidth+",height="+popupHeight+",left = " + winLeft + ",top = " + winTop + "");
  if (remote.opener == null) remote.opener = window;
}

function resizePopup( imgObj ) {
  var popupHeight = imgObj.height+155;
  var popupWidth  = 445;
  
  var winLeft = (screen.width - popupWidth) / 2;
  var winTop = (screen.height - popupHeight) / 2;
  
  window.resizeTo(popupWidth, popupHeight);
  window.moveTo(winLeft, winTop);
}