Okay, so I follow the instructions in the section [Extending the Editor][1] for creating a custom Inspector GUI for my script, but I cannot get my GUI to do anything. It shows up, but then nothing works. I'm placing it in the right place and everything!

Here's my code:

@CustomEditor (DayAndNight)
class DayAndNightEditor extends Editor {

function OnInspectorGUI () {
    target.dayLength = EditorGUILayout.IntSlider("Day Length (In Minutes)",1,1,1440);

    if (GUI.changed)
        EditorUtility.SetDirty (target);
}

}

What exactly am I doing wrong? [1]: http://unity3d.com/support/documentation/Components/gui-ExtendingEditor.html