[Greasemonkey] Simple keyboard shortcut script not working - Please Help!

[streetbuck]

Hello,

I'm trying to make a simple greasemonkey script that captures when the [Esc]
key (Keycode 27, if i'm not mistaken) has been pressed, and executes a
function.

The script is as follows. It seems fairly straightforward to me, but for
some reason, the script is not doing anything. Can anyone tell me what I am
doing wrong?

Any help would be highly appreciated.. Thanks in advance!


// ==UserScript==
// @name         MeeVee Keyboard Shortcuts
// @description	 Keyboard shortcuts for MeeVee
// @include       http://www.meevee.com
// @include       http://meevee.com
// ==/UserScript==

(function() {
    function keyUp(event) {
        if (!event) var event = window.event;
        if (event.keyCode == "27".charCodeAt(0)) {
            mvApp.guide.infowindow.close();
        } 
    }

    document.addEventListener("keyup", keyUp, false);
})();
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