function FFshow(url,w,h,x,y)
 {
  w = w + 30; h = h + 30;
  opts = "location=0,status=0,scrollbars=1,width="+w+",height="+h;
  mywindow = window.open (url, "FF", opts);
  if (x+y == 0) { x=screen.width/2-300; y=screen.height/2-250; }
  mywindow.moveTo(x,y);
  mywindow.focus();
 }