var win = null;
function NewWindow(mypage,myname,w,h,scroll)
{
  LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
  TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
  settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',resizable=yes,scrollbars='+scroll+','
  win = window.open(mypage,myname,settings)
}

function closeWindow ( win )
{
  if ( win != null && win.closed == false) win.close();
}