Number of Working days between 2 dates

Hi All,

I'm currently working on a file that has employee holidays/sickness etc. What I want to do is be able to see is a DATE FROM and DATE TO and next to it the total amount of working days between and including those dates. On top of the since employee's sometimes like to take half days I need it so that it can determine half days as well.

So for example I have an employee going to be off work from 29/10/2007 until 09/11/2007 12pm which is 10.5 days in total, but that includes weekends when I don't want it to. Also it comes out as 11 days at the moment because I can't figure out how to get it to determine is it is half a day.

What formula should I use or if someone could create an example that would be really usefull :D

kind regards