Help for Livecycle virgin

Hi all.

I have only been using Livecycle for around 48 hours so please be nice ;)

I have created a form which nearly works...

I have created a instance to add rows as required and this work fine but in the last column I have a Drop Down box. Within the box I have two option.

When I select option 1 in the drop down box I want it to make visible a text box. if I select option 2 in the list I want it to make another text box visible.

so far I have the following

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form1.Page2.Section8.Table3.Row1.DisposalList::change - (JavaScript, client)

if (this.xfa.event.change == "Option1") {

Section9.option1text.presence = "visible";
}
else {
Section9.option1text.presence = "hidden";
}
if (this.xfa.event.change == "Option2") {

Section10.option2text.presence = "visible";
}
else {
Section10.option2text.presence = "hidden";
}

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One of the problems I'm having is when I add a new row to the table with the instance button and then select option 2 when the first row id option 1 it overrides the first text field.

As i said... I don't really have a clue what I'm doing....

I think it could be something to do with it thinking that all the drop down list are the same as they are created using instances.

Any help would be greatly appreciated.

Thanks,

Dan