Advanced If statements

Hello everyone, I think this is considered advanced.

I need a little help with my logic.  I am writing a very simple employee time clock.  I have a form with 6 buttons(clock in, clock out, on break, off break, on lunch, and off lunch)  Basically they can hit each button as much as they want as is so I want to do a little advanced logic.

How would I shape the if statements to hide buttons once they have been clicked to only allow for the opposite button to be clicked.

For instance, if I clock in I shouldnt be able to clock in again untill I have clocked out.  If I go on lunch I shouldnt be able to click any other button until I have came back from lunch.

I am pulling the records from SQL (ex:

ID    User   Type            Date

34    31    Clocked In    2010-06-13 17:50:59
35    31    Break Start    2010-06-13 17:51:01
36    31    Break End    2010-06-13 17:51:01
37    31    Lunch Start    2010-06-13 17:51:02
38    31    Lunch End    2010-06-13 17:51:03
39    31    Break Start    2010-06-13 17:51:04
40    31    Break End    2010-06-13 17:51:05
41    31    Clocked Out    2010-06-13 17:51:06

)

Any help would be very helpful, even if its the terms I should use on google since I cant even seem to get the correct search query together to find an answer.