Excel 2003 Calendar Control won’t execute

I was able to add the control and put in the code but when I returned to the worksheet the calendar just stays on the page and does not execute. I did this at home on my laptop in 2007 and it worked fine. I am not allowed to upgrade at work. Can you tell me how I can know if the code is executing? In 2007 I had to trust the site and install the active x control but I was not asked to at work. Thanks.