Request.Form not working in IE

I am adding textboxes dynamically using javascript and trying to access their values using Request.Form[0].
It is working fine in firefox but when I use IE it gives error message "Object reference not set to an instance of object".
I don't know where is the problem?
I am using same code in both browser.
 
 <script language="javascript" type="text/javascript">
function AddRow()
{
var dvControls = document.getElementById("dvControls");
var cnt = document.getElementById("hdnCount");
var NextCount = parseInt(cnt.value) + 1;
cnt.value = NextCount;
var dvNew = document.createElement("div");
var dvNewId = "d ...