You can try starting with something like this, but it's behavior is going to be very browser-specific:
<button type="button" id="fullScreenOn">Enter fullscreen</button>
<button type="button" id="fullScreenOff">Exit fullscreen</button>
<script>
$(document).ready(function(){
$('#fullScreenOn').click(function(){
var doc = document.documentElement;
if (doc.requestFullscreen) {
doc.requestFullscreen();
}
else if (doc.msRequestFullscreen) {
doc.msRequestFullscreen();
}
else if (doc.mozRequestFullScreen) {
doc.mozRequestFullScreen();
}
else if (doc.webkitRequestFullscreen) {
doc.webkitRequestFullscreen();
}
});
$('#fullScreenOff').click(function(){
if (document.exitFullscreen) {
document.exitFullscreen();
}
else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
}
else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen();
}
});
})
</script>
As an alternative, you could use the Sawtooth Script "PopUp" to create a nearly full screen window.