full element on a webpage (escape full screen on changing link)

fullscreen.js

function cancelFullScreen(el) {
    var requestMethod = el.cancelFullScreen||el.webkitCancelFullScreen||el.mozCancelFullScreen||el.exitFullscreen;
    if (requestMethod) { // cancel full screen.
        requestMethod.call(el);
    } else if (typeof window.ActiveXObject !== "undefined") { // Older IE.
        var wscript = new ActiveXObject("WScript.Shell");
        if (wscript !== null) {
            wscript.SendKeys("{F11}");
        }
    }
}

function requestFullScreen(el) {
    // Supports most browsers and their versions.
    var requestMethod = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;

    if (requestMethod) { // Native full screen.
        requestMethod.call(el);
    } else if (typeof window.ActiveXObject !== "undefined") { // Older IE.
        var wscript = new ActiveXObject("WScript.Shell");
        if (wscript !== null) {
            wscript.SendKeys("{F11}");
        }
    }
    return false
}

function toggleFull() {
    var elem = document.body; // Make the body go full screen.
    var isInFullScreen = (document.fullScreenElement && document.fullScreenElement !== null) ||  (document.mozFullScreen || document.webkitIsFullScreen);

    if (isInFullScreen) {
        cancelFullScreen(document);
    } else {
        requestFullScreen(elem);
    }
    return false;
}