Disable F5 key

i need to disable the F5 key, i searched and i found some things but not clear for me, it should works in Firefox.

i found this:

function blockA(e) {
var keyChar = String.fromCharCode(e.which);
if (keyChar == 'A' || keyChar == 'a')
//self.scrollBy(10,10);

else if(keyChar == 'Z' || keyChar == 'z')
self.scrollBy(-10,-10);

else return false;
}
document.captureEvents(Event.KEYPRESS);
document.onkeypress = blockA;

but i cant make it work for F5 (keycode=116)

can anyone help me with this one?
thanks

Well you can try stuff like this by setting an onKeyPress handler on every object likely to receive focus, but remember two things:

• This is not reliable, it is very easy to circumvent, and chances are it'll behave differenly across different browsers.
• You'll only piss off your visitors. It is not up to you to decide what a user can and can't do with his browser. If you want full control, write an application, not a website.

its for an application, not for a website....

If you open it in a browser, it's a website in my book...

The word application has evolved. Now one must make a distrinction between desktop application and web application.

From an enterprise perspective, many applications are becoming web based... it allows for a wider user-base, and universal access to the web-application. I can see where skelterweb may be coming from.

However, from a technical perspective, I'm unaware of any way to disable the F5 key using web-code. Don't forget about Ctrl+R, or Ctrl+F5, or any other variations that any web-browser may have.

I think it may be better to just suck-in the fact that the user can refresh the page and perhaps workout someway so your web application doesn't blow-up when that happens.