Help with script for builing time slot

Help with script for builing time slot

Hi! I need help with my form! I will attach a preview: 

It is form for booking on - line. First field "Datum" is only date - based field upon which users can choose which date suits them best. 
1) Is it possible to somehow make it impossible to select certain days of the week, like Saturday and Sunday, upon which we do not work?

Second, and most important, the second field, called "Okvir termina" which means "Desired time slots". 
2) How can I make the script so that my users are not able to select a time slot that has been previously "reserved" on that day? So for example if Customer A chooses a time slot from 9 - 11 h, the customer B cant choose that same timeslot.

What would be right script to achieve this?

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