Dynamically Adding Form Elements Does Not Work Properly In Firefox?

Im using a JavaScript function to dynamically add rows of user-input data to a form, but Im having problems getting it to work properly with Firefox (works well in IE, though). We are using Struts 1.3 and JSPs, if that makes a difference.

The JavaScript function seems to work initially because the newly added row will show up on the JSP after the user enters their data and clicks a button that uses an onclick event to call the function. However, when I submit the form the new elements dont get included in the request. The result is that when I use the following code in my Struts Action Class to get all the parameter names submitted in the request, I dont receive the new form elements that were added by the JavaScript function and I cant process those newly added records:

Enumeration e = request.getParameterNames();

Here is the JavaScript code for the function that I call to dynamically add rows of data to the form.

function addData(tableId, distBedsCode, empCode, fte) {
var tbl = document.getElementById(tableId);
//grab how many rows are in the table
var lastRow = tbl.rows.length;

[Code].....

Ive tried using hiddenElem.setAttribute(name,) at the end of the above code, instead of something like hiddenElem.name = , but that didnt work. There is just some difference between the way Firefox handles things and the way IE handles them