javascript opencart

DONT MIND THIS 2 JAVASCRIPT - They are for product seo and category seo URLs
<script type="text/javascript">// <![CDATA[
$(document).ready(function(){
var keyword = $("input[name=keyword]").val();
$("input[name*='product_description[2][name]']").keyup(function(){
var text = $(this).val();
text = text.toLowerCase();
text = text.replace(/[^a-zA-Z0-9]+/g,'-');
$("input[name=keyword]").val(text);
});})
// ]]></script>

<script type="text/javascript">// <![CDATA[
$(document).ready(function(){
var keyword = $("input[name=keyword]").val();
$("input[name*='category_description[2][name]']").keyup(function(){
var text = $(this).val();
text = text.toLowerCase();
text = text.replace(/[^a-zA-Z0-9]+/g,'-');
$("input[name=keyword]").val(text);
});})
// ]]></script>



THESE ARE THE 4 JAVASCRIPT TO TAKE VALUES FROM FIELD AND ADD/SUBTRACT TAXES from my custom fields to original fields and vice versa:

<script type="text/javascript">// <![CDATA[
$(document).ready(function(){
var price = $("input[name=price]").val();
$("input[name*='IVA']").keyup(function(){
var text = $(this).val();
text = Math.round(((text*100)/121)*100)/100;
$("input[name=price]").val(text);
});})
// ]]></script>

<script type="text/javascript">// <![CDATA[
$(document).ready(function(){
var IVA = $("input[name=IVA]").val();
$("input[name*='price']").keyup(function(){
var text = $(this).val();
text = Math.round(((text*121)/100)*100)/100;
$("input[name=IVA]").val(text);
});})
// ]]></script>




CONIVA AND SENZAIVA ARE 2 CUSTOM FIELD PLACED IN THE SAME PAGE OF PRODUCT FORM.
<script type="text/javascript">// <![CDATA[
$(document).ready(function(){
var SENZAIVA = $("input[name=SENZAIVA]").val();
$("input[name*='CONIVA']").keyup(function(){
var text = $(this).val();
text = Math.round(((text*100)/121)*100)/100;
$("input[name=SENZAIVA]").val(text);
});})
// ]]></script>

<script type="text/javascript">// <![CDATA[
$(document).ready(function(){
var CONIVA = $("input[name=CONIVA]").val();
$("input[name*='SENZAIVA']").keyup(function(){
var text = $(this).val();
text = Math.round(((text*121)/100)*100)/100;
$("input[name=CONIVA]").val(text);
});})
// ]]></script>
BASICALLY I've 4 field: 1 opencart original (price) and 3 custom inserted in product form (IVA, CONIVA, SENZAIVA)
all 4 are in the same page (product form)
IVA value edit price value -- price value edit iva value
coniva value edit senzaiva value -- senzaiva value edit coniva value
but coniva and senzaiva edit also the price, and i don't want this.