var chat=0;
function popup_chat ( )
{
  if(chat) { if(!chat.closed) chat.close(); }
  chat=open("http://testk2.spbnews.ru/flex/chat.php",'chat',
  'toolbar=no,location=no,directories=no,status=no,menubar=no,'+
  'scrollbar=no,resizable=no,copyhistory=yes,'+
  'width=460,height=600,left=200,top=100,screenX=200,screenY=100');
  return false;
}