function disableF5(e) { if (e.which == 116) e.preventDefault(); };
    $(document).bind("keydown", disableF5); 

$(document).keydown(function (event) {
        if (event.keyCode == 116) {
            event.keyCode = 27;
        }

        if (event.keyCode == 27) {
            event.cancelable = true;
            event.cancelBubble = true;
            event.returnValue = false;
            event.preventDefault();
            event.stopPropagation();
            event.stopImmediatePropagation();
             return false;
        }
    });

function disableF5(e) {
        if (e.which == 116) {
            e.preventDefault();
            window.event.keyCode = 0;
        }

        if (e.which == 0) 
            return false;

    }

$(document).bind("keydown", disableF5);