I believe I am having a theme issue (custom theme built with Artisteer 3).

When an item is out of stock, the button reverts to my themes button no text saying 'out of stock'.

But I am not sure how to go about fixing, trouble shooting this issue. I have read 2 other posts here with a simalar issue but there wasn't any information on how to "look at the HTML markup that is output and adjust as necessary". Is there anyway I can get some more detailed and specific information on what/how to make changes in my theme to provide the right coding for this to work correctly?