Ok,
this way you can access a value in a textfield:
var myTextField = ff_getElementByName('NameOfYourTextField');
// Now the TextField which will get the value of your first TextField
var myTextField2 = ff_getElementByName('NameOfYourSeceondTextField');
// Set the value
myTextField2.value = myTextField.value;
This piece of code you can place on your last site in properties->scripts->initialisation->special->site (important: you have to click 'generate script') of each TextField you want to fill.
Then set the right names in the code.
Now when you will enter the last site, your TextFields should hold the before entered values
hope it helps..
matthias
ps.
it may be important to go to your form properties and set the following option:
i know it is german, but i hope you find your way