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Измена цены товара от значение переменной в javascript'е

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Стоит  Opencart 1.5.6

Внутри товара к textarea подключен скрипт  "count.js" который подсчитывает кол-во слов

counter = function() {
    var value = $('#bob').val();
    if (value.length == 0) {
var wordCount = value.split(/\s+/)
                     .filter(function(v){ return v.length>2 })
$(document).ready(function() {

Хотелось бы менять цену в зависимости от output этого скрипта, допусти чтобы цена "price" стала допустим:  

price = price * wordcount;

То есть чтобы цена менялась от кол-во слов в textbox'е



Не мог бы кто-нибудь подсказать где и как это можно сделать.

Знание php/js у меня на начальном уровне.

Заранее спасибо

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