Ajax Availability Calendar

hi,

i had contact with my provider ... he told me he can't help me ... but he get no 500 error ... please could you help me please ? I really loved your calendar...

mvg,
Katrien

I can't find a log that tell me something about my problem. Do you have a idea where to find that log ?
mvg, Katrien

The problem i have is that the calendar is not loading. What can i do to solve this ?
http://www.debackerspa.be/kalender1/index.php

greetz Katrien