Textbox

I am using a textbox with in a forloop, for each time when i click a button
it genarates a new textbox, so for example for first time there will be 1
textbox, i will enter some value into that textbox and i click the button
which adds another textbox and i enter someother value and i go on clicking
for to add a new textbox and enters some value. after creating 5 textboxes i
want to know the index of the textbox, basing on thet index i will find the
value and do some calculations and some more. so i must compulsorily need
index of the textbox.
SO can any one help me.
when i see in the view source i am seeing that 5 textboxes names are same.

<input type="text" name="txtStores" id="txtStores" value="0" size="4"/>
<input type="text" name="txtStores" id="txtStores" value="0" size="4"/>