[Resolved] Shut off Notices?

[The Hobo]

I'm using this code:

    if ($_REQUEST['action'] == 'updatewidth') {
        //set width cookie:
    }

Now, normally I wouldn't get a warning or notice with this on my webserver, but on my machine (where I test my pages), I keep getting:

Notice: Undefined index: action in C:\location\to\work.php on line 2

I'm willing to bet there's a way to shut this off in the php.ini. Can anybody tell me which setting it is?