Toggling the comments on and off now works. Here is how I do it:

    $display = false;
    if ( isset($_GET['comments']) ) {
        // set or unset the cookie
        if ( !isset($_COOKIE['comments_on']) ) {
            // create cookie
            setcookie("comments_on", true, time()+10000000);
            $display = true;
        } else {
            // delete cookie
            setcookie("comments_on", false, time()-36000);
            $display = false;
        }
    } else if ( isset($_COOKIE['comments_on']) ) {
        // cookie was set earlier, and set to display.
        $display = true;
    }

The $display variable is used to determine how to display stuff. Most of the problems I was having came from the fact that after the cookie's value was set, it wasn't available till the browser window was closed. (At least, this is what seemed to be the problem.)

Once you set the comments on they will display on the front page till you decide to turn them off. Let me know if there are any problems.

Now back to the #1 stress in my life, compilers. We have 2 weeks to finish our Ada compiler. We are still trying to finish up the stuff we were missing from the last assignment. This last assignment is 50% of our mark, so it needs to be much better.