<script>
  var winX=screen.width;
  var winY=screen.height;
  window.moveTo(0, 0);
  window.resizeTo(winX, winY);
</script>

 

 팝업으로 열때는

<script>
 var winX=screen.width;
 var winY=screen.height;
 win = window.open(url, 'winname1', fullscreen=yes, resizable=yes, scrollbars=yes, x=0,y=0,width=' + winX + ',height=' + winY);
</script>

 

이런식으로 처리하면됨.