function WinOpen(url, width, height, popupname)
{
  if (popupname == '') {
    popupname == 'popup';
  }
  if (width == 0) {
    width = 450;
  }
  if (height == 0) {
    height = 600;
  }
  xPos = (screen.width - width) / 2
  yPos = (screen.height - height) / 2
  window.open(url, popupname, 'width=' + width + ',height=' + height + ',scrollbars,!menubar,resizable,!status,left=' + xPos + ',top=' + yPos)
}