Excel Sick Days / Half Days

Hiya

I've been working on the attached spreadsheet and have it working almost perfectly, problem is that I need to be able to do half day E.g 0.5 and 0.5 makes 1 day. (:P)

I have no idea how to do this

Could someone help me by having a look at the spreadsheet and lettin me know?

Thanks in Advance

Pixie