To prevent popup window from resizing

Question

<script type="text/javascript">
  function openPopup(strOpen) {
  open(strOpen, "Info",
  "status=1, width=550, height=300, top=300, left=300, menubar=no,resizable=false,toolbar=no,status=yes,border=no,titlebar=no");
  }
</script> 

i want to prevent popup window from resizing, but resizable =no (or false) both are not working. how can i do that. i also want to disable maximize and minimize button and only close button should be available. m using firefox. any suggestions