executeOnKonami.js

var executeOnKonami = function(callback, code) {
    var codekeys = [];
    var codestr;
    if (code === null) {
        codestr = '38,38,40,40,37,39,37,39';
    } else {
        codestr = code.toString();
    }
    return function(e) {
        codekeys.push(e.keyCode);
        if (codekeys.toString().indexOf(codestr) >= 0) {
            callback();
            codekeys = [];
        }
    };
};