Function Modified To Fullscreen

I am using this code I got from a friend of mine but I wish to chnage the dimensions of the page to Fullscreen.

Code:

<script>
var win = null;
function popup(mypage)
{
w=800
h=800
mypage="images/screenshots/"+mypage+".swf"
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;

settings ='height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars=yes,resizable=yes'
win = window.open(mypage,"popup",settings)
}
</script>