how to update a cart with product details selected thourgh selects or radio's
<p>here is an example:</p>

<p><a href="http://store.apple.com/us/configure/MC375LL/A?mco=MTc0Njg1NzE" rel="nofollow">http://store.apple.com/us/configure/MC375LL/A?mco=MTc0Njg1NzE</a></p>

<p>each radio button looks something like this:</p>

<pre><code>&lt;input type="radio" value="065-0338" name="option.aperture" id="coherent_id_53"&gt;
</code></pre>

<p>when one of them is selected the price on the right changes. </p>

<p>i don't understand where the value is stored that relates to this radio option. i have viewed the source but cant make it out. How can i do something like this? i tried looking online but i cannot find anything. do you know of a source that i can read or maybe if you can write a quick explanation and i can piece it together? thanks</p>
