Shell Programming and Scripting

Suppose I have a Form with 5 fields.

2 of these fields have their imput limited by a rmenu choice. e.g. field1 and field2.

The rmenu choices of field2 are also limited by the choice made for field1.

name=filed1
rmenu=vary { a b c d }

name=field2
rmenu=vary { `script $F1` }

Initially the Form is presented with all fields empty. After filling the Form one could decide to change the value for field1. The value for field2 remains the same then. However that value could be invalid based on the new value for field1.

So whenever field1 is changed, I would like to see field2 to be cleared.

Any ideas how to do this?

TIA

use JavaScript to do this

pls go through attahced file