Export page content to MS Excel

Hi

I have a page that has an online income/expenditure calculator. It's simple enough.

The user input the amount spent on a variety of items each month, and then inputs incomes for each month. The page displays the surplus or deficit month to month.

All this is working fine on the page.

I need to give the user the option to download this information in MS Excel format.

I have the excel template - I just need to get the data from the page to the spreadsheet, and then push it.

Has anyone done this before? Any useful suggestions?

Thanks

Bill