using time of day (was newbie videoplayer questions)

[d]

ok, I'' try again, see if it gets to the list.
  time is running out for me since I have an exhibition on saturday  
where I wanted to use this.

I have been playing around with the time script I got from klaus and  
others
First I tried it with cards and one stack instead of several substacks
I put the time script on every card because it has to check what the  
time on opening each card.
and it works great until the time crosses the 12:00, 18:00, 00:00 line 
( the time of change-over to the morning, afternoon or evening  
part) ; then it starts to flip through all the cards and I can't stop  
it without quitting.
when using substacks it works because the stack closes before  
anything bad can happen but I do notice a quick flip-through-the  
cards at the same moments in time as with the cards version.
here's the script I am using. any ideas?

best regards
eddie d

   set the backgroundColor of this card to "black"
on opencard  --sthecorrectstackaccordingtothecurrentdaytime

    set the twelvehourtime to false
    put the time into tTime
     set the itemdelimiter to ":"
     put item 1 of tTime into tHour

     if tHour >= 0 AND tHour < 12 then
          go card "morgen_1"
     end if

     if tHour >= 12 AND tHour < 18 then
     go card "middag_2"
- end if

     if tHour >= 18 AND tHour < 24 then
         go card "avond_1"
     end if
end opencard


on mouseUp
   start player "tardes"
end mouseUp

on playStopped
   go card "middag_2"
end playStopped