need help understanding why this line in the code
<p>this code in book <a href="http://rads.stackoverflow.com/amzn/click/1935182323" rel="nofollow">jQuery in action</a> page 99</p>

<p>Why he wrote this line</p>

<p><em><strong>var current = this;</em></strong></p>

<pre><code>    &lt;!DOCTYPE html&gt;
&lt;html id="greatgreatgrandpa"&gt;
    &lt;head&gt;
        &lt;title&gt;DOM Level 0 Bubbling Example&lt;/title&gt;
        &lt;link rel="stylesheet" type="text/css" href="../styles/core.css"/&gt;
        &lt;script type="text/javascript" src="../scripts/jquery-1.4.js"&gt;&lt;/script&gt;
        &lt;script type="text/javascript" src="../scripts/jqia2.support.js"&gt;&lt;/script&gt;
        &lt;script type="text/javascript"&gt;
            $( function() {
                $('*').each( function() {
                    var current = this;
                    this.onclick = function(event) {
                        if (!event)
                            event = window.event;
                        var target = (event.target) ?
                        event.target : event.srcElement;
                        say('For ' + current.tagName + '#'+ current.id +
                        ' target is ' +
                        target.tagName + '#' + target.id);
                    };
                });
            });
        &lt;/script&gt;
    &lt;/head&gt;
    &lt;body id="greatgrandpa"&gt;
        &lt;div id="grandpa"&gt;
            &lt;div id="pops"&gt;
                &lt;img id="example" src="example.jpg" alt="ooooh! ahhhh!"/&gt;
            &lt;/div&gt;
        &lt;/div&gt;
    &lt;/body&gt;
&lt;/html&gt;
</code></pre>
