Excel experts of the world, unite!

[abbor]

Okay, here's the situation...

At my work, we have this salary arrangement..

All days from Monday to Friday, I have 103,98 NOK before 18:00.
Between 18:00 and 21:00 I get 124,98 NOK.
Between 21:00 and 23:15 I get 144,99 NOK.

So I put together this Excel-doc to find out what I'm gonna earn:

http://home.no.net/redheadn/JW/Bok2.xls

The problem is that I'm not a very good programmer, this is the first time I ever used the IF-function in Excel.

I want to type in C and D when I have worked from and to, and then let Excel fill in the correct times under the different wages.

It works every time I fill in a time where I've worked within all the wages, but as soon there's one exception(See line 5), everything fucks up because of my code..

Can anyone please tell me what functions I should use instead of those I've used?