Not me but....
Why are you hiding with jquery instead of css
#new, #exchange, #refund #date-select-kollel, #date-select-youth, #hour, #childre {display:none;}
And Why aren't you using
.on(change, function)
I am using ".change(function()", doesn't it work the same?
For some reason modifying the css didn't work, can't recall why, I will try again.
My jQuery is very basic...