Hiding and showing groups of elements
<p>I have a page where all items of class 'div_title_item' are initially hidden. Base on some paginator logic I would then like to show some of them.</p>

<pre><code>// initially
$(".div_title_item").hide(); // this works fine
</code></pre>

<p>Now the showing part. I tried below but it didn't work.</p>

<pre><code>// on some event for example
var collection = $(".div_title_item");
collection[0].show();
collection[1].show();
// etc...
</code></pre>

<p>Nothing is shown.</p>
