Thanks for all your help.
I did not understand the last one, since it involved start_date etc. But it was enough to point me in the right direction. Here is the code that I substituted the code in line 154 of reserve.php with:
$res->end = $res->sched['timespan'] == 15 ? $_GET['start_time'] + 45:
it works now with 45 min timespan and correct times.
Since it isnt possibel to change the main times, it is possible to change or add a number to the second row underneath the times. F.eks. I have 15 min incentments - so there are 4 slots underneath each of the one our times. I would like to use these for something like:
9:00 10:00 11:00
00 15 30 45 00 15 30 45 00 15 30 45
Or can I just "hardcode" the times so they are always 8.00 8.45 9.00 9.45 etc?
Thanks for a GREAT program and all your help - it works now with 45 min timespan and correct times - hopefully this is the last "bothering" post from me =)