Multiplying with jquery
<p>I have this simple script, i want to multiply Var a * Var b then Multiply this by Var C with  a set number eg 15.</p>

<p>But it doesn't seem to work?</p>

<pre><code>&lt;script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"&gt;&lt;/script&gt;

&lt;script&gt;
$('input[name="box2"]').keyup(function() {
    var a = $('input[name="box1"]').val();
    var b = $(this).val();
    var c = $(15).val();
    $('input[name="box3"]').val(a * b * c);
});
​
&lt;/script&gt;
&lt;/head&gt;


&lt;body&gt;
&lt;input name="box1" type="text" /&gt;&lt;br /&gt;
&lt;input name="box2" type="text" /&gt;&lt;br /&gt;
&lt;input name="box3" type="text" /&gt;
&lt;/body&gt;
</code></pre>
