JS Secure by Dessy Boris

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Test JS secure</title>
</head>
<body>

<div id='tt'>
    try to get me, my id is "tt"<br/>
    write in address url : <br/>
    javascript:alert(1);<br/>
    javascript:tmp_alert(1);<br/>
    javascript:tmp_alert(document.getElementById('tt'));<br/>
    then click here and you'll see as the "alert" AND the "getElementById" are still working ... only protected from you^^
</div>

<script type="text/javascript">


// secure


(function(){

    // overwrite/protect WINDOW.functions
    var alert = window.alert;

    // overwrite/protect DOCUMENT.functions
    var document_getElementById = document.getElementById;
    var d = {};
    d.getElementById = function(){var r = document_getElementById.apply(document,arguments);return r;};

    // sample
    d.getElementById("tt").onclick=function(){alert(d.getElementById("tt"));this.style.display='none';alert(d.getElementById("tt"));};


})();

    // erase this next line and nobody'll can do "alert" anymore .. execpt you in the previous code^^
    var tmp_alert = alert;

    window.alert = null;
    document.getElementById = null;


</script>
</body>
</html>