<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.