Javascript calculators

[sharosky67]

I am trying to work on a project that has three different calculators, I am a novice and can't figure it out. Any help would be greatly appreciated. Just email me with suggestions or links to help me out. Thank you ahead of time.

One is a currency converter, where you enter the us$ the country name and get a currency exchange.

The next one is a mortgage calculator, with the following fields:
Loan amount
year of loan (i.e. 15)
down payment,
Interest rate%
monthly payment and remaining loan

And the thrid one is a taxes calculator of:
Total Pay
Net pay
federal tax
and state tax

[AricC]

Post the code you have tried already.