not needed. if you are inactive for 1 hour or however long you have set in the admin panel, then your "online" images will go away to others viewing the board and they will know you are "away". If you have the board set to automatically log you in then you will not be aware of this because as soon as you click anything on the board, you will be logged in again and you won't see that the image was gone.
I'm baaaaaccckkkk. still doing work on donation basis. PM your needs.
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If a tree falls in the forest and nobody is there, does it make a sound?