input in one field needs to do auto calculate in another field
Im making a small application for keeping track of my receipts.
Sometimes I'll by stuff in different currency which i'll need to have converted into lets say $.
So I have 3 fields:
1) is "totalAmountDollar" in $ where i nost of my receipts goes.
2) is "totalAmountEuro" where i would put anything paied in Euro's
3) extra field to indicate if something has been put int the "totalAmountEuro" field.
What im trying to have these 3 fields to do, when i put something into "totalAmountEuro" field it needs to override whats in the "totalAmountDollar", and calculate and put into "totalAmountDollar" how much the the euro amount would be in dollars. Further more it needs to change the colour of the text in "totalAmountDollar" into blue. Aswell when something is put into "totalAmountEuro" the 3rd field will automatically come up with a euro sign...
Is this possible..?