Hi Daisy
If you do the Karl Jeacle calculator (and I have to use his 'old calculator', can't manage to work his newer version on my browser), when you've put in your total amount borrowed, start date for the loan, interest rate, etc, it produces a graph showing the interest vs capital amount and how they change over the duration of the loan.
Underneath the graph there are a number of buttons, which will show you the amount your loan will decrease each year, the total amount of interest paid over the duration (assuming your interest rate stays unchanged), etc.
You can also click a button for how much the capital amount will decrease on a monthly basis, and use the slider to set it for each year. It should give you an approximate idea of how much capital you'll pay back in 2011, 2012, etc.
Best, Molly