[X-or]

See Post #5 here:
https://stackoverflow.com/questions/...lr-was-pressed

I have added it to the header template and it did nothing.

the code below works for F5, do you know how to change it to include CTR key too?

<script type = "text/javascript">
    window.onload = function () {
        document.onkeydown = function (e) {
            return (e.which || e.keyCode) != 116;
        };
    }
</script>

----
***edit found the solution, use this to disable ctrl key :

<script type = "text/javascript">
document.addEventListener("keydown", function (event) {
    if (event.ctrlKey) {
        event.preventDefault();
    }   
});
</script>

works in combination with the above F5 script