Datepicker - Day names in calendar

Datepicker - Day names in calendar

Hi,
 
 I've downloaded the Datepicker event search custom file, swanky-purse theme. Everything is as it should be except the Day names, which are black and not the yellow color as per the demo. A second dowload of the dark-hive theme had the same result.
 
1) Could someone please help to resolve this, or point me in the right direction.
 
2) Also, how do I change the day names within the calendar to   dayNamesShort.
 
I'm new to jquery and trying to learn. If it helps, I am using Serif Webplus X2.
 
Thanks, Joe