How do I calculate subtotals using onblur and javascript?
<p>How do I calculate subtotals for each row of a product listing by using an input text field to enter one of the numbers?  </p>

<p>example:</p>

<pre><code>colA    colB            colC

100 - [text input] = [calculated result]

880 - [text input] = [calculated result]

720 - [text input] = [calculated result]

130 - [text input] = [calculated result]
...
</code></pre>

<p>I'm sure this is fairly easy to do with Javascript, but I've looked and can't find a simple answer.  I'm not very familiar with Javascript so I need a simple solution.  Thanks in advance for all the help! :)</p>
