How to auto populate a field based on drop down list unless specific item is selected

Question

Hi all,
Apologies if I have posted this in the wrong area but I am new to Adobe LiveCycle, JavaScript and these forums.
I am trying to build an Acrobat form using LiveCycle but am having trouble with the drop down lists.
Inititaly I simply wanted to populate fields in one table based on the selection of a corresponding drop down list in another table.
I used the following code and it worked fine:
Workbook.Content.Table1.Row3.AppropriationDetails.Row4.Cell1::change - (JavaScript, client)
var fFrom = xfa.resolveNodes("Workbook.Content.Table1.Row3.AppropriationDetails[*].Row4.Cell1");
var fTo = xfa.resolveNodes("Workbook.Content.Table2.Row3.AppropriationDetails[*].Row4.Cell1");
for (var i=0; i <= fFrom.length-1; i++) {
     fTo.item(i).rawValue = fFrom.item(i).boundItem(xfa.event.newText);
The problem is that now I want the above code to work UNLESS one of the items in the dropdown list is specifically selected in which case I want the text box in the other table to display a message such as "Enter details in the field below".
I have tried to create an If Else statement using the following code:
Workbook.Content.Table1.Row3.AppropriationDetails.Row4.Cell1::change - (JavaScript, client)
var fFrom = xfa.resolveNodes("Workbook.Content.Table1.Row3.AppropriationDetails[*].Row4.Cell1");
var fTo = xfa.resolveNodes("Workbook.Content.Table2.Row3.AppropriationDetails[*].Row4.Cell1"); 
for (var i=0; i <= fFrom.length-1; i++) {
     if (fFrom.item(i).rawvalue = "Option 3"){
     fTo.item(i).rawValue = "Enter details in the field below";
     else {
     fTo.item(i).rawValue = fFrom.item(i).boundItem(xfa.event.newText);
The code now populates the field with "Enter the details in the field below" no matter what item I select from the dropdown list.
Your help is greatly appreciated.
Cheers,
ozzy_q

Answer 1

Follow Up:
Ok so ive changed things up a bit and have had some more success.
I have used a Switch statement in my For loop to perform different actions based on the item selected.
The code looks like this:
Workbook.Content.Table1.Row3.AppropriationDetails.Row4.Cell1::change - (JavaScript, client)
var fFrom = xfa.resolveNodes("Workbook.Content.Table1.Row3.AppropriationDetails[*] .Row4.Cell1");
var fTo = xfa.resolveNodes("Workbook.Content.Table2.Row3.AppropriationDetails[* ].Row4.Cell1");
for (var i=0; i <= fFrom.length-1; i++) {
     switch (fFrom.item(i).rawValue)
     case "Option 3":
     fTo.item(i).rawValue = "Enter the details in the field below";
     break;
     default:
     fTo.item(i).rawValue = fFrom.item(i).boundItem(xfa.event.newText);
     break;
This code solves my problem but has thrown up a new issue:
When i select Option 1 or 2 from the dropdown list  the change in the text field is instantaneous, however if I select Option 3 it wont appear in the text field until I either select Option 3 a second time or select another item. Its as if the text field is a selction behind what I have enterd in the dropdown list.
Any thoughts?