Modify the date popup to only accept special days I may need your help please. I have installed the "Date" module and using it with the date popup (datepicker). I need to have the popup just accepting Wednesdays and Fridays as dates.

Can anybody give me some help on this issue?

Thanks alot!
You can use Date Restrictions in conjunction with Weekdays to acomplish this.

Just download both projects and enable weekdays_date_restrictions module. Then edit the date field and go to "More settings and values" > "Date Restrictions" > "Allowed values" > Choose restriction type: weekdays.