Jquery using css function
<p>So im just playing around with my jquery and got stuck with quite odd problem. so i'm getting width of div like this</p>

<pre><code>block_width = $(".grid_block").css("width");
</code></pre>

<p>Now i would like to do something with that width let's say</p>

<pre><code>container_width = block_width * 21;
</code></pre>

<p>and now if would alert <code>container_width</code> i would get <code>Nah</code> insted of numbers, what am i doing wrong?</p>
