function fullScreen() {
var el = document.documentElement;
var rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;

if (typeof rfs != "undefined" && rfs) {
rfs.call(el);
} else if (typeof window.ActiveXObject != "undefined") {
// for Internet Explorer
var wscript = new ActiveXObject("WScript.Shell");
if (wscript != null) {
wscript.SendKeys("{F11}");
}
}

}