Dynamic textbox through the Back button

Question

I have created a dynamic textbox in a JSP using Javascript.
When I submit the form in this JSP, the data's validated & a confirmation message is displayed.
On this confirmation message, when the Back button is clicked, I get the original form with the data entered for all the fields except for the dynamic textbox, because there is no dynamic textbox!
The textbox is to be displayed only when a condn is fulfilled. This is coded in a Javascript fn that gets called only when a particular value in the listbox of the form is selected.
How do I display the textbox when the Back button's clicked?

Answer 1

Thx for trying to help.
Here's the source code:
<script language="JavaScript">
<!--
function textBox(areaName, submitted)
var spanTxtID = document.getElementById('insertTxtSpan');
var areaNameText=document.createElement('input');
areaNameText.setAttribute('type', 'text');
areaNameText.setAttribute('name', 'areaNameText');
areaNameText.setAttribute('maxLength', 20);
areaNameText.setAttribute('size', '20');
//areaNameText.setAttribute('value', 'Khar');
//alert(areaName.value)
if(areaName.value=="Other")
submitted=false;
while(spanTxtID.hasChildNodes()) spanTxtID.removeChild(spanTxtID.lastChild);
spanTxtID.appendChild(areaNameText);
else { submitted=false; while(spanTxtID.hasChildNodes()) spanTxtID.removeChild(spanTxtID.lastChild); }
-->
</script>