How do I use Javascript inside Construct 2?

<script language=javascript>
document.onkeydown = function(){

if(window.event && window.event.keyCode == 116)
        { // Capture and remap F5
    window.event.keyCode = 505;
      }

if(window.event && window.event.keyCode == 505)
        { // New action for F5
    return false;
        // Must return false or the browser will refresh anyway
    }
}

</script>[/code:atigdj82]

thanks

var global = Function('return this')(); 

    document.onkeydown = function(){

    if(window.event && window.event.keyCode == 116)
            { return false; }
    }
[/code:266tm0v5]

It works, but only in Chrome.