Find if a cell contents appears more than once
<p>I have a table body that looks like the following: </p>

<pre><code>&lt;tbody&gt;
    &lt;tr class="basket_main"&gt;
        &lt;td class="basket_item"&gt;
            &lt;input type="text" class="basket_qty_txt" id="ctl00_ctl00_main_body_content_main_content_area_shopping_basket_ctl01_txt_qty_162" value="3" name="ctl00$ctl00$main_body_content$main_content_area$shopping_basket$ctl01$txt_qty_162"&gt;                    
        &lt;/td&gt;
        &lt;td class="basket_item prod_code" id="ctl00_ctl00_main_body_content_main_content_area_shopping_basket_ctl01_prod_code_col"&gt;
            CSM160
        &lt;/td&gt;

        &lt;td class="basket_item"&gt;
            SIL.MTG:RENAULT R19 1988 ON
        &lt;/td&gt;

        &lt;td class="basket_item max_qty"&gt;
            5
        &lt;/td&gt;

        &lt;td class="basket_item"&gt;
            &lt;input type="button" class="basket_item_button"&gt;
            &lt;input type="button" class="basket_item_button"&gt;
        &lt;/td&gt;
    &lt;/tr&gt;
&lt;/tbody&gt;
</code></pre>

<p>There could be many rows in this table, what I'm trying to find out is if the <code>prod_code</code> appears in more than one row in the table using javascript or jquery.</p>
