Fix

<script defer>
window.onload = function() {
var isCtrl = false;
document.onkeyup=function(e)
{
    if(e.which == 17)
    isCtrl=false;
}
document.onkeydown=function(e)
{
    if(e.which == 17)
    isCtrl=true;
    if((e.which == 85) || (e.which == 67) && (isCtrl == true))
    {
        return false;
    }
}
var isNS = (navigator.appName == "Netscape") ? 1 : 0;
if(navigator.appName == "Netscape") document.captureEvents(Event.MOUSEDOWN||Event.MOUSEUP);
function mischandler(){
    return false;
}
function mousehandler(e){
    var myevent = (isNS) ? e : event;
    var eventbutton = (isNS) ? myevent.which : myevent.button;
    if((eventbutton==2)||(eventbutton==3)) return false;
}
document.oncontextmenu = mischandler;
document.onmousedown = mousehandler;
document.onmouseup = mousehandler;

 if (document.addEventListener) { // IE >= 9; other browsers
        document.addEventListener('contextmenu', function(e) {
            alert(" No touchy!"); //here you draw your own menu
            e.preventDefault();
        }, false);
    } else { // IE < 9
        document.attachEvent('oncontextmenu', function() {
            alert("Dun do it!!");
            window.event.returnValue = false;
        });
    }
};

  document.addEventListener("click", function (event) {
    if ( event.target.tagName.toLowerCase() === "a" ) {
      var target = event.target.getAttribute("href");
      if(target.startsWith("#")) {
       window.location = "about:srcdoc"+target;
       event.preventDefault();
      }
    }
   }, false);
</script>