having status skype buttons

[aftermarket]

we've finally got skype up and running and want to have the skype button on our website with the status showing if we're online or not. the problem being is that as the skype line is constantly on the button shows our phone status as always available. we dont want the button to show this outside our office hours. so the question is, is there any way to have skype come off line during certain hours which would then show our skype button as offline