How to change values in the form?

Hi guys,
I am working on a small JSP project. I have a form in a page. It has several textboxes getting inputs from the user. In the JSP code, I want to change the value of the textbox based on the some condition in the JSP code:
<form ... action="the same page">
<input type="text name="theTextBox" value="" ...>
<%
if (javaObject.changeTextMethod() == true)
//I want to change the value of the textbox to something else here, I can't say theTextBox.value="whatever"
%>
If I create a form again, I have to write the same code many times. Is there anyway that I can reuse the form code and just change the values of the textbox?
Thanks in advance!
~Ji

Hi,
Thanks!
But when I try javascript. It seems in JSP code, the javacript function cannot be seen.
<SCRIPT language=javascript>
function change()
tBoxName.value="newValue";
</SCRIPT>
<%
if (condtion == true)
change(); // The error is: change() is not defined.
%>
Also, if the textbox is insice <form> </form>, in javascript function, the textbox cannot be seen either. Would you please tell me how exactly to use javascript in this situation? Thanks a lot!
~Ji

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