question about buttons

Hey, everyone. I have the buy now buttons and the sold buttons when inventory goes down to zero. How would I add an unavailble button if inventory is 0, but will be available soon. If an item is sold, i want it to say sold, however if it's unavailable...it needs to say unavailable. Thanks for any help.

Oh, let me make this clearer:

If an item is sold out, i want it to say sold out. However, if it is unavailable now and won't come out for another few weeks, it still has the sold button on it. How can I just change that to unvailable. Example:

http://midsouthcoin.com/midsouthcoinstore/index.php?main_page=index&cPath=31

scroll down....the latter one's aren't available until later in the year, but since it's 0 in inventory, it says sold out.

Thanks.

You would have to write code to accomplish that.